How to Get an A* in A-Level Chemistry: Step-by-Step Revision Roadmap & Exam Secrets
Only ~9% of students achieve an A* in A-Level Chemistry each year. It is universally considered one of the hardest UK A-Levels. Here is the exact study framework used by Imperial Chemical Engineering and Oxbridge Medicine offer holders to score 90%+ in AQA, Edexcel, and OCR A chemistry exams.
Key Topic Walkthroughs Included
Pillar 1: Organic Reaction Route Maps (The 30-Mark Hack)
Organic chemistry accounts for nearly 50% of Paper 2. Most students make the mistake of revising reactions in isolation. A* students build interconnected synthesis maps linking alkanes → haloalkanes → alcohols → aldehydes/ketones → carboxylic acids → esters → acyl chlorides.
Must-Know Reagents & Conditions Checklist:
- Nucleophilic Substitution: Warm aqueous KOH vs Ethanolic KOH (Elimination).
- Electrophilic Addition: H2SO4 catalyst for hydration of alkenes.
- Oxidation of Alcohols: Acidified K2Cr2O7 under distillation (aldehyde) vs reflux (carboxylic acid).
Pillar 2: Mathematical Physical Chemistry Precision
Physical chemistry calculations (Kc, Kp, Ka, Kw, Thermodynamics $\Delta G = \Delta H - T\Delta S$) account for ~20% of total exam marks. To avoid losing silly marks:
- Always state units: $\text{mol dm}^{-3}$, $\text{kPa}$, $\text{J K}^{-1} \text{mol}^{-1}$ (remember to convert J to kJ when calculating $\Delta G$).
- Significant figures: Give numerical answers to the smallest number of significant figures provided in the question data.
Struggling with A-Level Chemistry Calculations or Mechanisms?
Learn 1-on-1 with an Imperial College Chemical Engineering or Oxbridge Offer Holder.
Explore A-Level Chemistry Mentorship →Pillar 3: The 80/20 Past Paper Mark Scheme Strategy
AQA, Edexcel, and OCR examiners reuse standard wording every single year. For 6-mark practical questions (e.g. gravimetric analysis, recrystallisation, or electrochemical cell setups), memorising the exact bullet points from official mark schemes guarantees top marks.
Use our free Practice Center to drill exam questions by topic and test your mark scheme recall.