200 Marks is JEE Main is difficult but possible, You need a proper strategy and good determination, What makes most aspirant difficult to score 200 is not their knowledge or Problem-solving ability but lack of determination.

Why You must be constant on Solving Problems, First try some mock test and judge where are You this will give You a rough Idea that where are You now, Once You Identify Your current situation you will also aware of How much You need to work to get close to 200 Marks in JEE Main. 

Analyse You week and strong areas from the Mock test and decide which one You think a strong part of You but failed to score well,then work for those Topics this is the best way to increase You scores , Mock tests are good feedback to tell You whether You are Going right or Wrong , Rest all I think You knows that which books to follow but let me tel, You again For Chemistry, Stick to NCERT once You are sure about everything in all four parts go to other books, Maths is RD Sharma and Loney;s books, For Physics HCV is sufficient.