How to be good at physics if I am not very good at solving tough problems?

First thing is going through the NCERT book of Physics. Get your basics clear because its the very first step before you proceed.

You should be aware of important topics and priortize the topics as per the weight age of the topics in exam.

Make a complete list of derivations, formulas, and experiments in your syllabus and keep that list somewhere you can see it every day.

It is very important to practice mocks and tests in regular terms to anaylse your strength and weak areas and prepare accordingly. Practice previous year sample papers as well.

For basic understanding of concepts go through online learning videos which will help you with the preparation and basic understanding.

Some of the important topics are for Physics to give emphasis on are:

• Atomic Structure in Modern Physics
• Properties of Matter and Fluid Mechanics
• Electromagnetic Induction and Alternating Current
• Circular Motion
• Rotational Motion
• Electrostatics Laws of Thermodynamics
• Ray Optics
• Newton’s Laws of Motion
• Motion in Two Dimension and Projectile Motion

Get a grasp on important topics to fetch marks.

Good Luck.