Hello Kasireddy,

First thing that I would say is since you would be appearing in 2020  so you have enough time to complete the entire syllabus without skipping any part .You must be very clear with your NCERT's especially of chemistry and bio.

The list of important topics from each subject is as follows -

Biology -

Human Physiology

Plant Physiology

Structural Organization in animals

Cell Biology

Ecology

Genetics

Biotechnology

Reproduction

Chemistry -

GOC

Atomic Structure

Mole

Equilibrium

Thermodynamics

Chemical Bonding

Periodic Properties

Solid State

Physics -

Kinematics

Work ,power energy

SHM

Current electricity

Capacitance

AC

Modern Physics

Semi conductors

All the best for your future .Hope this helps .

Hello aspirant,

For NEET, everything from the NCERT is important. NEET does not follow a specific pattern for the questions, so it will be misguidance if I mention a few topics and leave the others. The topics which you find difficult are the ones you should focus on. Some of such topics are-

Animal Kingdom and Plant kingdom from Biology, since questions come from outside NCERT too.

Problems in physical chemistry and organic chemistry. 

Rotational motion and waves in physics.