Hi Aiza!

Its better if you read it , its necessary not only for +2 boards but for your other competitive exams as well . Often direct questions are asked from NCERT in JEE mains+advance and in others too.

Boards will be starting from next month so have to speed up. You can either do by reading and underlining the important points or take up small points. 

hope this answers your query, all the best

cheers!