I would like to suggest you some books which are very good.

 

YOUR MAIN PROBLEM IS LACK OF CONCEPTS.

 

Physics :

 

MTG Interactive physics - Do the whole book religiously and read the preface given. YOUR PHYSICS WILL BE VERY STRONG ONLY IF YOU REFER THESE BOOKS. Initially , I would suggest you to buy only one book (The first vol.). If you like it then go for the rest.

 

Chemistry :

Physical Chem : P.W. Atkins / Shishir Mittal (Disha Pub.) . Awesome book for self - stud. (Buy any one)

P. Bahadur - Problems

 

Organic - You have it. MTG.

 

Inorganic - FIITJEE Notes + NCERT books (Don't buy NCERT. Just borrow from sumone).

 

MATHS :

Thomas and Finney - Calculus

M.L. Khanna Maths

 

However the most important part of self study is that you must not look at the solutions of the problem. If you can't solve the problem , read the relevant theory protion and return again. Instead of what is right , try to find out where you did go wrong. Study the theory very carefully and with interest and apply the above techniques. Solve problems from the +1 level to the +3 level gradually. Don Jump.

 

Study these techniques and then you can solve either FIITJEE RSM or Brilliant Study material as you wish.

 

Personally , I feel that Brilliant study material is good.