I'm glad to be of help!
The last two RC were tough. in RCs I find myself rushing through the specific details questions coz of timing issues,
Does that mean you are running low on time by the time you get to the later RCs in the section? If so, then you'll need to find ways to manage your time better so that you don't continue to have this problem.
As a general rule, most people have to bail / guess on about 4-7 problems in each section. Where do you tend to spend the most time for the least-likely positive return? When you hit a really hard problem, it's better to let that one go faster and reallocate that time elsewhere.
To help you avoid what you describe (not realizing how long you've spent), read this article:
http://www.manhattangmat.com/blog/index ... nt-part-1/In particular, pay attention to section 4 to help you with per-question timing and cutting yourself off.
For CR, you'll need to figure out why you made the mistakes you made. Did you misunderstand something in the argument? Or overlook a detail? Was that due to speed, mental fatigue, paying attention to / getting distracted by other things?
Or was the issue more in the answers? Maybe you understood the argument just fine but fell into a trap answer. Why? Why did the wrong answer look good and why did the right one not look as good? That will help you to NOT use that same kind of reasoning in future (since that reasoning led you to a wrong answer).
Also, make sure that you know exactly what you should be doing for each different type of CR problem - they're asking for different kinds of reasoning. This can help:
https://www.manhattangmat.com/blog/inde ... reasoning/Talk to me more about your RC difficulties. In order to hit the overall averages, you can spend up to about 3 minutes reading a problem and you need to average about 1.5 minutes on specific detail and inference questions.
Are you struggling with the timing in the sense that you need more time than that? Or are you struggling with the timing because you fall behind in the overall section timing, so then you have to work more quickly - and that, of course, makes things a lot harder.
As I said earlier, figure out your absolute weakest areas and guess fairly quickly on some # of the hardest questions that you see so that you can then spread that time among other not-so-hard questions where an extra 30 seconds would actually make a difference. Since you're already scoring 80th percentile and want to move up to, say, 90th, guess like this on about 4 questions in the section.
Stamina and timing issues are there when I give CATs, trying to correct those by giving atleast 2 mocks in a week.
That's like practicing for a marathon by running two marathons a week. You're just going to tire yourself out. Plus, good practice exams are limited, so you don't want to waste them.
When you sit down to study, plan out what you're going to do over a 2-hour period. Then GO for 1 hour, no stopping, no checking email, no getting up for something to eat, etc.
Take a 10-15 minute break, then GO again for 1 hour. Then take a more substantial break.
(Note: I'm specifically NOT recommending that you do what I just described for 3-4 hours. It's actually *more* mentally taxing to study than to take a test, because when you're studying, you're trying to create new memories, not just access old ones.)
You can do this while at work, too, or doing anything that requires mental concentration. Make yourself actually do whatever you're doing for an hour straight. You can build your stamina a little bit every day this way!
Also, don't forget that what you do earlier in the test affects your mental stamina for verbal (the final section). When you're deciding whether to keep going on a really hard IR or Quant question, part of the equation is: how much mental energy is this going to use up before I get to verbal?
Remember the name of the GMAT game: it's all about how you manage your two scarce resources, time and mental energy. Every decision you make is in service of managing those resources over the entire length of the test.