Brother, if you are having conceptual problems in physics, then FIRST study NCERT textbooks. After that I would recommend you to study HC Verma. If you think that you have mastered the content of the chapter which you are currently reading, then solve problems from IE Irodov for challenging questions of that topic. Further, you can solve DC Pandey if you have time left.
Remember, your fundamentals about any topic should be clear.
BEST OF LUCK!