I'm sorry I didn't get to this before your test - I'm only on here to answer questions every few days, so something posted two days before a test isn't likely to get a response in time - just FYI for others reading this. I hope your test is going very well right now!
In any event, my answer to what to do during the last 2 days is the same for pretty much everybody, regardless of strengths and weaknesses. High level review only, and no more than 2 hours of it on the last day before the test. DO NOT take a practice test during the last few days. Review the primary math and grammar facts you need to know (not EVERY last little thing, just the things that are most likely to be tested). Review your strategies for each question type (and question sub-types, where appropriate). Review your pacing strategies. Know how you're going to get to the test center. Get your ID, food, and drink ready to go. That sort of thing.
I'll answer your other questions for the benefit of others reading this.
For RC, I do agree that it's useful to study these on a computer screen as much as you can (because it's harder to read on the screen and then take notes on paper). But it would definitely mess up your rhythm to have to flip back and forth to see the text - you need to be able to see the text at the same time as you work on the problem. You might re-do the formatting, or you might print the material and then tape it up above your desk or to your computer screen (so that you have to look up to read and look down to take notes).
I will also say that I am more careful about the sources that I use, especially for CR and RC. There are no facts tested on those two question types; it's all about the language of the text and the questions. It's really important, for those, to study from either official questions or questions that were made by someone who had the necessary resources to do the research and make sure that the questions mimic real questions as much as possible.
Both PS error are stupid error and most of DS are are GMAT trap, I dont know how can I avoid them.
The first step in not falling into a trap is understanding how the trap works and how to recognize it when you see it in the future. If you see the trap, you may be able to avoid it. If you don't see it, you're probably going to fall right into it. Your test is... well, now, basically, so there isn't a lot you can do at this point, but for others reading this, it's really important to study WHY you made any errors you made, including falling into traps. Actually spell out for yourself what the trap is, why you fell into it, and how you might have noticed it and avoided it. Keep a log of these traps and continue to study how to spot the trap and how to avoid it.
Last four questions did in hurry and were wrong.
Yep, pretty much anything done in a hurry is much more likely to be wrong. The question is: where did you spend time that you should NOT have spent earlier in the test? How should you have known that you were spending too much time on those? When should you have cut yourself off and moved on? How could you have made an educated guess?
But I have nothing else better to practise
Again, just a bit of advice for others reading this. Once you've done the OG material, you are not done with that material unless you have gotten your goal score. There is a TON you can learn from those questions; go back over them again and again. Until you have learned everything you can from your existing questions, going to do a bunch of new questions is not really that worth your time. You're not going to suddenly start to do amazingly well on the new questions. So don't just use questions once (or maybe twice) and then move on to other materials. Pick those questions apart until you could practically write them yourself! (Or, at the least, you could explain why the test writer did write the problems in that way - every last word or number.)
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