The fact you want to improve yourself is an important first step.
You want to get out of 5.2 into 5.3 as soon as you can. When you are in 5.2, they assume you cannot handle the more advanced material and continue to feed you with unchallenging material. How can you get out of this trap? For some, a determined effort by yourself to free yourself from this may suffice. But for most people, you'll need someone competent to diagnose your problem and to chart a pathway out of 5.2. I do not know everyone can be helped: I've dealt with some students in a similar situation, and just cannot understand why they have so much difficulty dealing with some relatively simple concepts. So I have cases where I could not lift my student up from 5.2. On the other hand, I remember a highly motivated student of mine, after about 8 lessons was able to demonstrate to his teacher to put him in 5.3.
I believe a one-on-one external help is the way to go.