hiiii
All the above suggested solutions are valid ..
See the key point is that u try to understand the concepts .. use some book say Arihant's book and start going through the theory of one chapter, once u know the theory then start solving problems ... going from easy to hard level .
While u solve problems focus on the concepts rather than the craming of way to solve the problems ... gradually u will start understanding the topics .. n u will not face any problem ..
Keep confidence in urself ... cheerooo