Chemistry is the most scoring subject among PCM, in which JEE aspiring students can get 100% if their foundation in the concepts is strong. Most of the questions are comparatively easier in the Chemistry section than the other subjects in IIT JEE. And knowing everything that's there in the NCERT is one of the many things that you should be concerned about.

The different parts of chemistry have a slightly different approach which is to be followed. In the case of organic chemistry practising the chemical equations, reactions and mechanism will help you out. For physical chemistry, you need good conceptual knowledge and regular practice.