Hello Smylie

You should know that it's quite late for you to start the preparation. So, now that you're starting it late please give it your full attention.

You don't have the time to confuse yourself by reading more books, now as boards are also near. You should make your understanding of all the NCERT concepts very well. Start with seeing the syllabus of JEE Mains and try to start with a topic that has the most weightage according to the trends.

Once you've gone through the concepts, please start doing the sample papers.

Hope it helps!

All the best!