Dear aspirant,

from your question it appears that you want to know that whether the math NCERT is enough for you to get good marks in maths section of jee main.

NCERT textbooks not enough for preparing for JEE exam. You have to use other important books like RD Sharma, RS Aggarwal, Arihant previous year question papers, etc.

in the remaining time however I suggest you must go with the previous year question papers and solve those papers completely first try to solve in the time limit and then see for your mistakes and then solve the complete paper do this with at least 20 question papers till the exam date which is 18 to 23 July 2020.

Hope this helps. Thank you