Improving any subject is not going to happen by sudden thinking. It will be a slow and difficult process.
Try to develop love with the subject you find tough. This is the easiest way of improving your performance in the subject you find tough like for example Physics.
When you start loving the subject, the subject starts making more sense to you. So, rather than seeing physics as the tough subject, look at it as a subject that explores the mechanism and working. In physics, certain ideas are assigned mathematical constants. Conceptual understanding in Physics is best reinforced through equations.
Some of these equations are very simple, while some are enormously complex. Understanding them is critical when tackling both simple and complex problems. Even difficult and confusing problems are solved by using several simple equations.
Despite all this, the ultimate key to understanding physics as a subject is to understand that it is mainly about visualization. The more effectively you are able to picture a question, the more likely you are to get the response correct. A better knowledge of physics means a better knowledge of the universe.
Numerical is an important part of Physics. You should have a good understanding impact of equations on a certain problem, visualizing the problem statement will help you in solving virtually any physics numerical.