Hello Tarun,
Although some people say that lots of memorization isn't necessary for the GMAT, the fact is that the more you have memorized the better you *can* do.
Some things to memorize are:
1. Positive and Negative -- if a DS question states that xy < 0 or a/b < 1, that means that either x or y is negative and usually the key to solving the problem is realizing that fact. If in the second one, b is positive, then a < b. If, on the other hand, b is negative, then a > b.
2. If a number, when squared is less than the number (x^2 < x) that means that x is between 0 and 1 (0 < x < 1).
3. Odd and Even combinations. All that you need to know is Odd * Odd = Odd and Odd ± Even = Odd. Everything else (aside from division) is Even.
4. Learn how to use the slot method:
https://vimeo.com/11327864 Thursday with Ron December 3, 2009.
5. Treat RCs like big CR problems. I am not able to do well on verbal when I write down any information. I've tried writing down things for each paragraph, main ideas, tone, scope, etc., but it is a waste for me. Instead, I imagine that each RC is a part of a Wikipedia article which I've just stumbled across. That instantly gets me interested and I read everything like how I would normally read one of those articles. If I'm able to understand things on the first time around, I spend less time re-reading the passage afterward. If you're able to write down and find it helpful then go for it -- this is just in case you needed another approach.
6. For SC's -- Read through MGMAT's SC book and do all of the problem sets. Go through the Idioms list in chapter 9 and read each correct one. Use your ear to hear if it sounds correct. If you review it enough, eventually the correct ones will start to sound correct and then you can just trust your ear. If there are any incorrect ones which sound correct to you, you must train yourself to avoid them. You're already typing out everything nicely, which is a plus. Continue writing and speaking properly from now until test day and correct any mistakes you make along the way.
7. Geometry -- Memorize 30:60:90 (x:x√3:2x) and 45:45:90 (x

x√2). Memorize different right triangle combos: 3-4-5, 6-8-10, 9-12-15, 12-16-20, 8-15-17, 5-12-13, 10-24-26. Memorize the formula for Area of Equilateral Triangles: A = [s^2(√3)]/4. Memorize all other area, surface area, and volume formulas you can.
8. Factors and FOILs -- Memorize (a^2 - b^2) = (a + b)(a - b), (a + b)^2 = a^2 + 2ab + b^2, etc..
And don't worry too much about the test scores. Kaplan tests seem to have a lower test score than what people actually get.
If I could start my prep over, I would use the MGMAT OG Archer alot more than I did. It has some really good analysis tools. Also, do your practice problems this way:
https://www.gmathacks.com/study-tips/how ... blems.html. It really makes a difference.
Hope these couple pointers helps out!
--Rishi