{"id":296124,"date":"2026-02-12T16:56:31","date_gmt":"2026-02-12T11:26:31","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=296124"},"modified":"2026-02-12T16:56:31","modified_gmt":"2026-02-12T11:26:31","slug":"cbse-class-12-science-key-topics-study-hacks","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/cbse-class-12-science-key-topics-study-hacks\/","title":{"rendered":"CBSE 12th Class Science: Key Topics & Study Hacks"},"content":{"rendered":"

The CBSE exam class 12 isn’t just another board exam. It’s the one that opens doors to engineering colleges, medical seats, and scholarship opportunities you’ve been working towards.<\/span><\/p>\n

Here at Aakash, we’ve trained lakhs of students who’ve walked this exact path. Some panicked. Some over-studied. The toppers? They emphasized high-weightage subjects and studied wisely with the appropriate resources.<\/span><\/p>\n

The truth is simple: Class 12 Science awards merit to students who understand <\/span>what to study<\/span><\/i>, and not to students<\/span> who study everything<\/span><\/i>. Let’s break down specifically what topics are of the greatest importance in PCB and how to tackle them.<\/span><\/p>\n

Class 12 Physics: Practice Helps Score Big<\/span><\/h2>\n

Physics isn’t about memorising derivations. It’s about understanding where marks are hidden and grabbing them systematically.<\/span><\/p>\n

Important Key Topics in Physics\u00a0<\/span><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Topic<\/b><\/td>\nWhy It Matters?<\/b><\/td>\nWhat to Focus On?<\/b><\/td>\n<\/tr>\n
Ray diagrams (lenses, mirrors, instruments)<\/b><\/td>\nOptics carries ~18 marks – the highest weightage<\/span><\/td>\nImage formation, sign conventions, lens formula applications<\/span><\/td>\n<\/tr>\n
Capacitor combinations & energy<\/b><\/td>\nElectrostatics unit – 16 marks total<\/span><\/td>\nSeries\/parallel circuits, dielectric effect, energy stored<\/span><\/td>\n<\/tr>\n
Kirchhoff’s laws & Wheatstone bridge<\/b><\/td>\nCurrent electricity core topics<\/span><\/td>\nComplex circuit problems, potentiometer applications<\/span><\/td>\n<\/tr>\n
Biot-Savart law & cyclotron<\/b><\/td>\nMagnetism unit – 17 marks<\/span><\/td>\nMagnetic field calculations, working principle with diagrams<\/span><\/td>\n<\/tr>\n
Faraday’s law & motional EMF<\/b><\/td>\nElectromagnetic induction backbone<\/span><\/td>\nLenz’s law, self and mutual inductance concepts<\/span><\/td>\n<\/tr>\n
AC circuits – resonance & power factor<\/b><\/td>\nAlternating current numerals<\/span><\/td>\nLCR series circuit, impedance, phasor diagrams<\/span><\/td>\n<\/tr>\n
Photoelectric effect & matter waves<\/b><\/td>\nDual nature – 12 marks unit<\/span><\/td>\nEinstein’s equation, de Broglie wavelength numericals<\/span><\/td>\n<\/tr>\n
Semiconductor devices & logic gates<\/b><\/td>\nElectronic devices – 7 marks<\/span><\/td>\np-n junction, transistor configurations, Boolean algebra<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Study hack from Aakash for Physics: <\/b>Optics alone gives you 14-18 marks. Master ray diagrams and lens formula – that’s 20% of your paper sorted. For Electrostatics and Current Electricity, create one formula sheet and revise it daily. Students who do this never forget them in the exam hall.<\/span><\/p>\n

Class 12 Chemistry: NCERT Is Your Best Friend<\/span><\/h2>\n

Every reaction, every condition, every reagent in NCERT has appeared in boards. That’s not an exaggeration, that’s a pattern we’ve observed across years of question paper analysis.<\/span><\/p>\n

Important Key Topics in Chemistry<\/span><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Topic<\/b><\/td>\nWhy It Matters?<\/b><\/td>\nWhat to Focus On?<\/b><\/td>\n<\/tr>\n
Nernst equation & EMF calculations<\/b><\/td>\nElectrochemistry backbone, 4-5 marks<\/span><\/td>\nGalvanic vs electrolytic cells, numerical practice<\/span><\/td>\n<\/tr>\n
Integrated rate equations<\/b><\/td>\nChemical kinetics core concept<\/span><\/td>\nFirst-order derivations, Arrhenius equation<\/span><\/td>\n<\/tr>\n
Raoult’s law & colligative properties<\/b><\/td>\nSolutions chapter most-asked<\/span><\/td>\nDepression in freezing point, osmotic pressure numericals<\/span><\/td>\n<\/tr>\n
Crystal field theory<\/b><\/td>\nCoordination compounds crucial<\/span><\/td>\nOctahedral splitting, colour of complexes, and isomerism<\/span><\/td>\n<\/tr>\n
SN1 vs SN2 mechanisms<\/b><\/td>\nOrganic chemistry game-changer<\/span><\/td>\nDifferences with examples, reaction conditions<\/span><\/td>\n<\/tr>\n
Named reactions<\/b><\/td>\nAppears in every paper<\/span><\/td>\nSandmeyer, Cannizzaro, Hoffmann bromamide, Kolbe’s<\/span><\/td>\n<\/tr>\n
Functional group conversions<\/b><\/td>\nConversion questions are common<\/span><\/td>\nAlkane \u2192 alcohol \u2192 aldehyde \u2192 acid flow charts<\/span><\/td>\n<\/tr>\n
Biomolecules & Polymers<\/b><\/td>\nEasy 4-5 marks are often ignored<\/span><\/td>\nStructures of glucose, starch, and types of polymers<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Study hack from Aakash for Chemistry:<\/b> Don’t memorise reactions randomly. Write them in three columns:<\/span><\/b><\/p>\n