First understand the concepts Properly and also You need to be good at Mathematics To Solve Physics Problems if You are unaware of the basic concepts of Vectors, Calculus, and coordinate Geometry then First make them clear so that You don't face any Problem while solving Problems in Physics. 

To understand the concepts You can follow HC Verma it is the very versatile book used by Both JEE as well as medical aspirants the concepts are explained in a very simple language, Once You understand the concept solve problems by very basic level and then Gradually increase the level.You will find easy to understand the Physics.