Hi Pawan. Excellent prep thus far and good questions in this post.
What is your target score? You want to
exceed your target score on at least one and ideally two GMATPrep CATs. It sounds like you are getting close to the 740-750 range. Another three weeks could be all the prep you need.
Are you sure the GMATPrep Quant problems you missed were easy? Without difficulty information, it can be hard to tell. Often a Quant problem feels easy the second time around, once you have already chipped away at it. Taking an
MGMAT CAT, which gives you difficulty info for each problem could help you narrow that down. But, if the problems were easy and it was the pressure of the section causing you to underperform, then the solution is more timed Quant Sections and a focus on being more careful on each problem. If that causes you to slow down a bit, it is probably worth it for getting more easy problems right, and can be compensated for by skipping a few problems with Topics you find rather difficult.
By the way, randomly guessing on a few problems in each section is not a problem as long as you are not aiming for a 760+ score. For a vast majority of people, a few well selected guesses is a good time management philosophy.
Your RC and CR troubles probably demand more practice. What strategy guides have you learned from and practice have you done for those subjects thus far?
I've just published a new type of GMAT prep book which you may find helpful in these final weeks of prep to make sure you use your time optimally.
GMAT Clarity is currently only $7 only Amazon. It contains great guidance on how to boost your RC and CR skills as well as building your mental endurance and maximizing your composite score at the end of your prep. I'd be happy to help you use it.
Best,
Thomas