JEE not only tests your knowledge of various formulae, equations but also checks your understanding of these concepts. It tests how well you know your subject and how you can apply the knowledge and interlink this knowledge within other topics. In Physics, start from 11th books and slowly progress to 12th books. Read Newton's law of Motion, Work, Power and Energy and Circular Motion. Do not skip Electrostatics, Oscillations and Waves and Optics and Modern Physics. Focus on solving the numerical questions by applying relevant formulae. Now Chemistry had Physical, Inorganic and Organic. Study in the same order. Gain strong foot over formulae of Chemical Bonding, Equilibrium, Kinetics and Radio Activity. Focus on D and F block elements. Memorise the periodic table. Practise Maths as much as you can. Give priority to topics like Integration, Probability and Statistics, Complex Numbers and 3D Geometry. Also focus on Matrices and Circles.