Physical chemistry relations, periodic trends, reagent-to-product maps for organic conversions, and the qualitative-analysis colours MECEE-BL keeps asking about.
Chemistry is 50 questions — the largest single block alongside Physics — and it splits roughly into physical (calculations), inorganic (trends and colours) and organic (reagent → product). Physical is the only part you can derive under pressure; the other two have to be recalled. Spend your last revision hour on the tables, not the equations.
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See the plansMole Concept & Stoichiometry Made Simple
Avogadro's number, molar mass, molarity and the calculations that show up every year.
Organic Chemistry: Functional Groups You Must Know
The functional groups, homologous series and reaction types that dominate the organic section.
Basic Concepts in Chemistry: Masses, Radicals and Formulae
The vocabulary every other chemistry chapter assumes: valency, the carbon-12 mass scale, the radical charges you must know cold, and the two routines that turn a percentage into a formula.
Stoichiometry: The Mole, the Limiting Reagent and Ten Numericals
Dalton's postulates and where they fail, the five laws of combination, Avogadro's law and its uses, and every mole calculation the paper can ask, worked step by step.