The Organic Compounds Containing Oxygen chapter accounts for the most number of questions in the JEE Main exam.
Furthermore, once you’ve finished these chapters, you may go on to the easier ones, such as Hydrogen, States of Matter, Hydrocarbons, Surface Chemistry, and so on.
The base of Mathematics is built on Sets, Relations, and Functions, so you don’t have to start learning from the beginning.
You may devote your focus to the easier and less important chapters such as Inverse Trigonometry, Application of Derivatives, Heights and Distances, and Statistics.