GMAT Strategy

I was able to download the file. What was the problem you faced? You have to be signed in to download btw.

I did everything in blocks of 40, topic-wise. It made sense to me to do it that way because i would first revise the topic and then have a go at the problems. I tracked my progress/errors relentlessly so that helped.
You could try the same and see how it goes.

There exists a file that lists the problems topic-wise both for PS and DS. See if you can find it. I'd do PS for a topic till i ran out and then switched to DS for the topic till i finished it and only then moved on to the next topic.

GMAT ain't nothing but practice.

The GMAT is not as hard as Calculus 3 or Differential Equations. But to many people, it is.

If you keep doing Calc 3 or DE questions over and over and over again, eventually you're gonna get good at them.

Same strategy. Yeah I've heard of people who study or look over a GMAT book for 40 minutes or maybe a week and get over 700. These people are rare.

In reality, for people who are not mentally gifted like these people, the only solution is practice. Practice makes perfect. It's a pain in the ass to sit all day and solve problems, but that's what you have to do.

If you don't have the discipline, you have to at least take 2 weeks to sit at your desk from morning till night solving problems.

From reading your posts, I think the best way for you to dramatically improve your score is to practice writing with perfection! Cut out all the abbreviations, make sure everything is spelled correctly, and use proper punctuation.

In addition, start reading a smartly written magazine or newspaper. The more you read, the more prepared you will be to tackle the verbal questions. While you are reading, think about arguments, conclusions, assumptions, inferences, etc, and pay attention to how the author uses grammar/specific vocabulary to progress through the article.

While this side project is happening, you will also need to do some prep with actual GMAT questions. Put away all of your books and prep materials EXCEPT the official guide. I really think that reading multiple guides confuses people. The language and tone won't be consistent with the real test, except for in OG.

When you go through the OG again, don't redo all of the problems. Just look at all the problems you got wrong. Look at the problem, try to redo it, and read the explanations of why each incorrect answer is incorrect. If you get confused about any problem's explanation, post it on this forum for clarification.

As for quantitative, there's still room for improvement, but since you are stronger here you are more likely to study quant! It is just easier for us to study more of what we like and what comes naturally. In your case, quant is what you're better at, so verbal prep will be challenging. Avoid spending too much time studying quant. Instead, just brush up on the basic techniques for solving difficult problems.

My suggested study plan for you:

Study every single day for 40 minutes. That's it. Spend 15 minutes reading and analyzing an article. Spend 10 minutes doing 2 difficult quant problems, and make sure to FULLY understand the explanation of how to do the problems. Spend 15 minutes doing 2 difficult verbal problems, either SC or CR. On days that you do RC, take 20-25 minutes for just one passage.

Take days off when you don't feel like studying, but make it a habit.

PS: I'm definitely not an expert or consultant, but I really think this is the best way for you to improve your score. Learn from your mistakes, understand as much as you can, and learn from real life.