All my experience through all these years of studying, internships and working in industries and helping other students have taught me that you do not have to be a super master mind professor in order to understand and comprehend a phenomenon in physics or a theorem in Maths. All you need is to pay attention. You need to be observative. The rest will be simple to accomplish. It is not how much information and stuff do you remember but how to connect them. A math professor I had back in my school years used to say: "The less you remember, the happier you are". A mathematical theorem is based on another one or an axiom. Two different phenomena in Physics are very often described in the same way. That means the same mathematical model. The overview of the general method is quite simple. Categorise and split into chapters and after that enlist all of them in your mind. For example in Maths: Complex numbers, Linear Algebra, Geometry, Calculus, etc. In Physics: Fluid Dynamics, Thermodynamics, Heat Transfer, Solid-Rigid Body Dynamics, Oscillations (Mechanical, Electrical), Electromagnetism etc. Something also very important: Use your imagination. If you are able to translate every single sentence in Maths and Physics or even Chemistry into a good drawing or an equation you already have 50% success and in many cases 80%. That means you comprehend the subject. Ainstain once said: "Sometimes imagination is more important than knowledge". I say there are both necessary. I can show you how to do it!