If you are aiming only for boards and not for any entrance exam, then accordingly I can tell you. In physics, first of all learn all the formulas and derivations well. As soon as you're able to derive the equations and use the formulas, solving numericals becomes automatically easy for you. Doing this much ensures you almost 45+ marks on 70 since derivations and numericals have aporimiately 40-45 marks weightage. Then you have 7-10 mcqs and rest are theory concepts. For them you can go for easy chapters theory inititallly like modern physics, waves, etc.
For chemistry, try to go in a flow for organic chemistry. Learn every reaction properly and then solve the exercise behind the textbook. For inorganic chemistry, the only option you have is to by heart things. And for physical chemistry, practice numericals and again learn properly as well.
Best wishes. Thank you
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile