i m in 12.. i read only ncert .. is it possible for me to crack mains?

NCERT books helps you to build your concepts strong. It is to clear your basics. If you want to clear your exam you need to put extra effort in it. You can refer previous year papers to understand the exam pattern and level of questions. Focus on important topics. You can solve as many as MCQs for your practice. Go for complete mock test series to analyze your preparation at regular interval of time.

You can also recommended below books after NCERT for your preparation-

• Concepts of Physics by H. C. Verma
• Fundamentals of Physics by Halliday, Resnick and Walker
• Problems in General Physics by I. E. Irodov
• University Physics by Freedman and Young

• Higher Algebra by Hall and Knight for Algebra
• Coordinate Geometry by S.L. Loney
• Differential and Integral Calculus by N. Piskunov
• Calculus and Analytic Geometry by Thomas and Finney for Calculus
• IIT Mathematics by M.L. Khanna
• Course in Mathematics for IIT-JEE by Tata McGraw Hill publications
• Problems Plus in IIT Mathematics by A Das Gupta
• Trigonometry by S L Loney

Chemistry is divided roughly into a) General Chemistry with a huge emphasis on Physical Chemistry, b) Organic Chemistry and c) Inorganic Chemistry.

• University Chemistry by Freedman and Young for Physical Chemistry
• Organic Chemistry by Morrison and Boyd for Organic Chemistry
• Organic Chemistry by Solomons and Fryhle for Organic Chemistry
• Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry
• Modern Approach to Chemical Calculations by RC Mukherjee