i wanted to know howdo i plan my studies and in which chapters shud i concentrate the most to get a good rank... im in 11th now

More weight was given to chapters like coordinate geometry - 13%, integral calculus - 10%, vector - 3 dimensional geometry & determinants - 10% and trigonometry - 3%. In chemistry, 40% questions were easy, 50% had a medium level of difficulty and 10% were difficult. 40% weight was given to physical chemistry and 27% to inorganic chemistry.

 it is difficult to say which chapters, but if you insist ,I''d say the 5 most important chapters in phsyics in 11th and 12th are

1. Mechanics and Electricity and Magnetism
2. Modern Physics
3. Optics
4. Heat and Thermodynamics and Waves and Sound
5. Measurement and errors

 
Make your basics clear.