hi deeksha
try using o. p aggarwal
or dinesh publications.
they are very good books for concepts
for higher mcqs try M.L khanna
in maths more questions u do better u get
For students weak in mathematics, I think RD sharma is the best book to grasp the basics...try avoiding very difficult questions...it helps strengthening your confidence in the subject you can also try the Vidyamandir study material
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