Dear Pranita Raj Sinha
This is a common problem faced by most of us.
I suggest u do te following.
1.Follow padhuka book or any other book u r comfo with except icai material.
2.Use icai material / practice manual for revision.
3.Try solving problems on ur own without refering to the book. U will make mistakes, but try solving it till the end , then refer back to the book and see what mistakes u do.
4.Once u find out the mistakesu do, solve the problem again without referring, preferably after 1 or 2 days , so that u can strenghten ur skill.
5.solve as many problems as u can , ther is no short cut to success.
6.Solve past question papers , take 3 hr test similar to exam conditions.Most students face time constrain in Paper 5 exam.
This is more than enough for u to have a control over the subject.
ALL THE BEST