Thanks , those are some solid suggestions. I have thought about some but have not truly applied them on a consistent basis. You are right though. You have to think about how the GMAT will trick you. Also when they mention a restricting option, that is essential to the answer. They never give extraneous information. Always understand how that restricting option defines the answer.
Concerning geometry, that does seem like a great approach. It is very abstract and definitely will try and apply that method.
I think what I may do is do a set of DS questions with a strict 1 minute time limit for each and see how I do. Because with PS, I feel that if you understand all the concepts, you can always usually figure out the answer, but it may take 3 minutes or so, for someone like me. If I hit the 1 min DS mark, then that will do it.
As for Verbal, I have not tried with background noise but I think it may be a good idea to help improve focus. As you do for DS, you also need to recognize CR and RC patterns.
Now I can't vouch for this ,but something to look for as you are doing questions to see whether you see similiar patterns.
CR I have noticed that If true questions usually appear out of scope at first glance but are not and answers that appear too close to the statement are usually wrong. The opposite is true for assumption questions. In CR you have to constantly ask yourself questions based on the statement and answer choices. You have to go through each choice and break the logic, doing so by posing hypothetical questions.
RC , if you dont understand the passage , you are going to get at least half the Q wrong. RC is where you can really kill your time. You read a passage and you still spend 2 min a question, that means you didnt understand it and you will be playing catch up, and in verbal catch up is really hard to do. So back to that approach, hardest RC passages you can find, under a strict time limit, with background noise. I think I am going to start doing that. For me there is no excuse to get any RC question wrong. The answers are all there in the passage.
Another problem I have with RC is the meaning of words. I guess that can't really be helped at this stage. I am a native speaker but they can throw in hard words and you have to just hopefully be able to eliminate other choices.