I think you need to do more practice on Qr, Math is not hard unless you make it hard. It is all about practice, do a lot of practice and you will improve!
I heard Math destroyer has many questions, so I would get that and practice more.
Postponing is a good thing, for 2 weeks or 3 max, don't make it longer otherwise you might start forgetting the stuff you already know.
The question is: What's wrong in QR? Postponing without dealing with the cause of the problem won't help
Is it timing or you are not good in answering the question even when you do the section untimed?
The real solution is If timing is the problem, you need more practice, like a ton of exercises every day for 2 hours.
If the timing is not an issue, then you need to understand the basics all over again, after each new topic, do a lot of exercises.
As for the pat, I don't know what to suggest, I am not familiar on how to improve it. But I would get more resources anyway! For example, achiever : read this link if you have time to see what people says about it.
DAT achiever
Also, try to learn some of the techniques online, I saw many videos that teach some of the methods to solve the PAT problems.