How to visualise concepts instead of relying on memorising things.

I can understand basic forces and kinematics easily when pondering upon it for a while. But, when it comes to other topics like electricity, waves, sound etc., it feels abstract. I score good marks in physics exam, but I don't get a feel of the concepts stated above at school. I don't want to merely study for acing school or exams, I want a strong grasp on them. Can you please suggest some steps I should take being a 9th grader?