Tip 1: for SC - First answer the question (eliminate or whatever technique you use). While reviewing look at the wrong answer choices very thoroughly to have a better sense of what actually is wrong. You will be able to develop an ear for the wrong choices that way. That will be immensely helpful
Tip 2: for RC - I need to make a compromise with speed and understanding. Generally I take note of marker words, ignore data or support premises, and look for conclusions and main ideas more often than not, there will be a main idea/primary purpose question for almost all passages
Tip 3: for SC - I guess the most important part about hitting it right on SC is that somehow you have to be GENUINELY INTERESTED in the passage. Even if it's about something that you don't fully appreciate or get excited about, you should convince your brain and all your life's work has been on the purpose of reading that passage
Tip 4: I would say
MGMAT CATs are traditionally difficult (like the 700+ ones), The GMAT quant questions, however, rely on tricks
Tip 5 : For CR - When I practice strengthen/weaken questions I would try really hard to make my own correct answer choices. I would rely a LOT on my common sense. So for every official questions that I see, I will try to create an an official answer of my own. However for other questions like inference, flaw, boldface I would throw my common sense out of the window and look at the prompt structure and create meaningful conclusions which cannot be invalidated