My suggestion to you will be , join a coaching institute like allen or akaash..there you'll get a feel of the level of competition that you are going to face, also the faculty there will teach you more than just of boards level so obviously your boards percentage will increase dramatically...and since i am also a medical aspirant from allen (kota)..my personal advise to you will be...don't waste the precious time of 11th and 12th in just studying for boards...take a feel of the competition by joining a coaching institute.....they will train you in every possible way so you can conquer the exam
Best of luck for your future.