Best way to do math is one step at a time
For JEE topics like
vectors and 3d
and complex numbers
have lot of weight and are relatively easy to grasp. So finish these topic first and get confidence.
Then move on to Broad sections in this order
i.e
1. Coordinate
2. Algebra
3. Trigo
4. Calculus
one chapter at a time read thory and practice and make it strong, A single strong chapter is better than several weak ones.
Coaching material is enough for this stage to get sufficient practice, ones you get proficient then move to TMH or some similar book
All the best
