You will have to work hard for thorough study YOu have got time to study to prepare ..
Do take care of few things i.e alweys revise the material after coming back from school or tutions ... it wont take much time but it helps alot in remembering things for long time. Make a time table and cover the topics from 11th and 12th . Remove all the negative thoughts from inside, coz you can do it ... focus and dedication very essential … Join some coaching institute, test series etc & forget all your other activities for a year!!!. Do not do a lot of books…..clear your concepts and give them more time to practice question. Do hard work and believe in yourself…
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Amit - IT BHU