Use the manhattan books to solve OG problems. If you feel that you are not strong in basics. Learn using the books, make flash cards and error logs. Try to apply them in problems. Review a lot. Solve less and review more. Probably you have been continuously solving and missed reviews.

Check out this link on how to analyze a problem.

https://www.beatthegmat.com/mba/2009/10/ ... ce-problem

DS questions are mostly to find a value or yes/no type. Be clear with what is being asked, if its find a value then we should get only one particular value there cannot be more than one, if its yes/no - it should be either one and not both. The first time i tried solving problems i was barging the problem with all the information in the question and the statements. I messed up, the only answer choices i ended up were C or E. So try rephrasing the question first. It is more important to know what is asked and what is needed to solve. Go through the statements one by one and try to solve. Follow the A D, B C E order. While solving problems make flash cards for shortcuts like if x^2 < x then 0 < x < 1. For percentage increase/decrease you need both the original and the increased value. Is x < y - we need to know the signs of both variables. For absolute value problems you have to split up the eqns. So the statements should have something related to this. You will learn a lot of these shortcuts when you review a lot. So try to follow the AD BCE approach and review a lot to learn more shortcuts.

If you are a non native speaker verbal part is quite difficult to improve in a short time.

Check out these links on how to improve to verbal

https://www.beatthegmat.com/550-to-720-i ... 72949.html

https://www.beatthegmat.com/need-help-on ... tml#384706