Dear Aspirant,

if you carry out all the preparation methods suggested by you in your query there is a good chance you will be able to score well in the examination. It is also advised that you use other textbooks as well other than NCERT for Mathematics and Chemistry. Whereas, when it comes to solving previous years question papers you may solve from the past 10 years as the papers dating earlier than that may differ as there might have been change in syllabuses.