cake walk for you. Study the theory part in physics. Problems toh you can solve on your own. Since you've scored fairly well in NSEP , it shows that your physics is solid enough to take on the first months of JEE Prep. As for languages, I'm not the right guy coz I chose French and scored 96 in that as well (we had ridiculous teachers who probably took a 30 day crash course). Considering all my French prep was done using YouTube only, I consider 96 to be a good score.
To conclude, what I'm saying is don't completely spend your time for boards even if your parents force you to (believe me as the same happened with me).
As for books, study inorganic coz that will be time consuming. You won't have to know any concepts for thaT. Just study like it's civics. And solve some questions online. Or ask for some dpps here.