Sec 4 Chemistry Crash Course June 2026 — Stoichiometry & Mole Concept Singapore

Stoichiometry and the Mole Concept are two of the most calculation-heavy and mark-intensive topics in the O-Level Chemistry syllabus. Students who master these chapters can gain significant advantages across multiple sections of the exam paper — not just in the dedicated calculation questions, but in organic chemistry, electrochemistry and acids and bases questions as well.

If your Secondary 4 child finds chemical calculations overwhelming, confusing or inconsistent — scoring well sometimes but dropping marks unpredictably — Miracle Learning Centre’s June 2026 Sec 4 Chemistry Crash Course is built precisely for this challenge.

What Is the Sec 4 Chemistry Crash Course?

Miracle Learning Centre is running an intensive 5-day Sec 4 Chemistry Crash Course from Monday 15 June to Friday 19 June 2026. Sessions run from 9.30am to 2.30pm daily with a 1-hour lunch break included — so your child arrives, learns, eats and revises without any interruption to their focus.

This is a structured, expert-led revision programme — not a passive reading class. Every day targets a specific high-weightage Chemistry topic with notes, worked examples and exam-style practice built into the session.

Meet Your Teacher — Mrs Lew

The Chemistry crash course is led by Mrs Lew, one of Singapore’s most respected O-Level Chemistry tutors. Mrs Lew is an ex-school teacher from Maris Stella High School and Crescent Girls’ School, where she specialised in O-Level Chemistry for over ten years.

Her reputation in Singapore’s tuition landscape is built on one thing — results. She is well regarded for her exceptionally detailed and clear explanations of complex chemical concepts, particularly in topics like Stoichiometry, Mole Concept and Organic Chemistry where students typically struggle most.

Mrs Lew has also published a book titled O-Level Chemistry Practice Questions Classified Topic by Topic — a resource used by students across Singapore preparing for their national examinations. This level of expertise means your child is not just getting tuition. They are getting examination strategy built on years of watching exactly where students lose marks and exactly how to stop that from happening.

“Thanking Mrs Lew who helped me tremendously to achieve an A1 for my Chemistry in the O-Level examination.” — Estella Goh, Fairfield Methodist Secondary

“Mrs Lew is very engaging during her lessons and always tries her best to explain Chemistry concepts clearly until we fully understand them. She also provides revision worksheets and carefully marks them.” — Joey, Google Review

What Is Stoichiometry and Why Does It Matter for O-Levels?

Stoichiometry is the branch of Chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. In plain terms — it is the maths of Chemistry.

For O-Level students, Stoichiometry questions appear in:

• Paper 1 — multiple choice questions involving molar ratios and formula masses
• Paper 2 — structured calculation questions worth 4 to 8 marks each
• Paper 3 — free-response questions that combine Stoichiometry with other topics like Electrochemistry and Organic Chemistry

The reason students lose marks in Stoichiometry is rarely because they do not understand Chemistry. It is almost always because of one of these four reasons:

• They do not know how to set up the mole ratio correctly from a balanced equation
• They confuse molar mass, molar volume and number of moles in multi-step problems
• They make unit conversion errors when switching between grams, moles and volumes
• They do not know how to handle limiting reagent questions which require an extra calculation step

Mrs Lew’s crash course session on Stoichiometry directly addresses all four of these failure points with a step-by-step structured method that students can apply consistently across every type of Stoichiometry question they encounter in the exam.

What Is the Mole Concept and Why Do Students Struggle?

The Mole Concept is the foundation upon which all of O-Level quantitative Chemistry is built. Without a solid understanding of what a mole is and how to use it, students cannot solve Stoichiometry, Electrochemistry calculations or concentration-based questions reliably.

Key areas within the Mole Concept that students frequently misunderstand include:

• The relationship between moles, mass and molar mass (n = m/Mr)
• Using Avogadro’s Number correctly in particle-count calculations
• Calculating molar volume of gases at room temperature and pressure
• Working with concentration and volume in solution-based mole calculations
• Converting between moles, molecules, atoms and ions in compound questions

Many Sec 4 students treat the Mole Concept as a formula to memorise rather than a concept to understand. This leads to inconsistent performance — getting straightforward questions right but failing to adapt when the question is framed differently or combined with another topic.

Mrs Lew’s teaching approach ensures students understand the logic behind the Mole Concept, not just the formula — so they can handle any question variation that appears in the actual O-Level paper.

Full 5-Day Chemistry Crash Course Schedule

The June 2026 Chemistry Crash Course covers five high-weightage O-Level Chemistry topics across five focused days:

This is a complete O-Level Chemistry revision programme compressed into one highly productive week. Students who attend all five days will have covered every major topic category in the Chemistry syllabus before the school term resumes.

Why Stoichiometry & Mole Concept Is the Most Important Day to Attend

Of all five days in the Chemistry crash course, Tuesday’s Stoichiometry and Mole Concept session carries the highest mathematical impact across the rest of the paper. Here is why:

Stoichiometry and the Mole Concept do not exist in isolation. They connect to:

• Electrochemistry — calculating the mass of substance deposited during electrolysis requires Mole Concept
• Acids and Bases — titration calculations are Mole Concept in disguise
• Organic Chemistry — percentage yield questions use Stoichiometry ratios
• Qualitative Analysis — writing and balancing ionic equations connects back to molar ratios

Attending the Stoichiometry and Mole Concept session makes every other Chemistry topic easier to tackle. It is the foundation session of the entire week.

What Your Child Will Achieve After This Session

By the end of the Stoichiometry and Mole Concept session with Mrs Lew, your child will be able to:

• Calculate the number of moles from mass, volume or number of particles confidently
• Use molar ratios from balanced equations to solve multi-step problems
• Identify the limiting reagent in a reaction and calculate yield accordingly
• Solve concentration and volume problems in solution-based calculations
• Handle percentage yield and percentage purity questions accurately
• Connect Mole Concept principles to other O-Level Chemistry topics
• Work through exam-style questions under timed conditions with a structured method

Who Should Attend the Chemistry Crash Course?

This crash course is designed for:

• Sec 4 O-Level students taking Chemistry in 2026
• IP students from Nanyang Girls’ High School, Singapore Chinese Girls’ School, Hwa Chong Institution, River Valley High School and MGS who are studying Chemistry at an advanced level
• Students who scored below B3 in Sec 3 Chemistry and want to rebuild their foundation
• Students who are strong in theory but weak in calculations — Stoichiometry and Mole Concept will close that gap
• Students who want complete O-Level Chemistry revision in one structured week
• Sec 3 students looking to get ahead on Sec 4 topics during the June holidays

Sec 3 students are welcome to join relevant topic days as early preparation for their Sec 4 year.

A Special Note for IP School Parents

If your child is enrolled in the Integrated Programme at schools such as Nanyang Girls’ High School, Singapore Chinese Girls’ School (SCGS), Hwa Chong Institution, River Valley High School or Methodist Girls’ School (MGS), the Stoichiometry and Mole Concept content covered in this crash course is directly relevant to the IP Chemistry syllabus.

IP Chemistry demands a higher level of conceptual understanding and application than standard O-Level Chemistry. Mrs Lew’s teaching style — with its emphasis on understanding the logic behind each concept rather than formula memorisation — is particularly suited to IP students who need to apply chemical principles across complex, unseen question contexts.

Many IP school students have attended Miracle Learning Centre’s Chemistry sessions and found that the structured, concept-first approach significantly improved their ability to tackle IP internal assessments and year-end examinations.

What Makes Miracle Learning Centre’s Chemistry Crash Course Stand Out

Published Chemistry Author as Your Tutor

Mrs Lew literally wrote the book on O-Level Chemistry practice. Her publication O-Level Chemistry Practice Questions Classified Topic by Topic is evidence of the depth of her exam knowledge. Your child is being taught by someone who understands every question type, every marking scheme and every common mistake.

Simplify Reactions. Build Precision. Score Higher.

The entire crash course philosophy is built around one promise — simplify reactions and solve chemical calculations with confidence. Every explanation is crafted to remove unnecessary complexity and give students a clear, repeatable method they can trust under exam pressure.

Small Class Sizes for Maximum Impact

Large tuition classes mean your child’s specific confusion goes unnoticed. At Miracle Learning Centre, small class sizes ensure Mrs Lew can identify each student’s individual weakness and address it directly during the session.

Notes, Worksheets and Exam Practice Included

Students receive comprehensive printed revision notes for every topic, plus worksheets modelled on actual O-Level exam questions — at no additional cost. These materials support continued revision after the crash course ends.

Lunch Provided Every Day

A full 5-hour learning day requires proper nutrition. Lunch is provided daily so students maintain energy and concentration throughout every session.

Proven Track Record Across Singapore

Miracle Learning Centre holds a 5.0 star Google rating across 285 verified reviews. Parents and students from schools across Singapore — including neighbourhood schools and top IP institutions — have consistently reported significant grade improvement.

“My daughter’s Chemistry grades improved from C6 to A2 within a short span of time. They are called a miracle for a reason.” — XN M, Google Review

“I was nowhere near passing Chemistry and was worried and clueless. However, Mrs Lew did a miracle and I was one of the few who passed.” — Nigel Joseph, Google Review