As u r in 11th class.So i should prefer some good books which will really help u:
Regular Course:
1.R.D.Sharma for Maths
2.H.C. Verma For Physics Or G.C. Aggarwal (Too good to build IIT base)
3.Numerical chemistry (Dr. P. Bahadur) ,MTG organic chemistry , O.P. Tondon (for ingorganic)
Compitetion Level Books:
1.A Das Gupta(MCQ) For IIT--------K.C.Joshi For Both IIT n Aieee
2.IIT-Jee Phycics Chalanger (Disha Publication) For IIT--------D.C. Pandey (Arihant) For Aieee
3.Numerical chemistry(Dr. P. Bahadur) , IIT Chem. Arihant.-------Aieee Chem. Disha Publications
*For Chem. Organic n Inorganic read text books again n again ....... There is no need to practice more MCQ for it.
*Moreover,Never switch on to MCQ at early stage,First build ur concepts through Text-Books
* If u have applied for any correspondence then leave all above and stress on that only.
*If u want to apply for any correspondence notes then go for Brilliant Tutorials Or Paradise(It assures that 85% of ques in IIt n Aieee r from there notes only)