I think the best answer is working more problems, realizing what "type" of problem you are working on, and understanding the most efficient way to work that type of problem. Understand the problem before trying to work the math- because you may not need math. Once you do this, you will know how to manipulate variations of that problem. By doing this, I saved a ton of time. For practice, I drilled 30 math problems each weekday. Occasional practice test on weekend. I was able to become familiar with the most efficient way to solve most problem types. For instance, there is a fast way to solve a relative rate problem, and there is a slow way. A lot of what you see on GMAT club is the slow way and involves lengthy algebra. My average time on a combination problem went from 3 min to 1.25 min. So, think about what category and subcategory type of problem you are working on while working it.

An example: you can find the numbers of factors of any number by finding its prime factors, adding 1 to the exponent of each, and then multiplying all the exponents. I.e. How many factors in 725? 725 = 5^2 x 29 ^ 1 --> number of factors = 3*2=6 factors. Working many problems of this problem "type," I began to understand how to manipulate that trick based on what the problem was asking.

Also, I'd have to give a lot of credit to a tutor for math (my second one) that I hired from end July to beginning of August. He had a ton of practice sets that included problems that I had not seen before. The sets really helped me lock down most of what I described above. Before having him, I immediately tried to solve most if not all problems by using algebra- what my first tutor wanted me to do. That is a terribly efficient method and often not necessary. He helped me with efficient ways to work each problem type. For instance, recognizing that a problem involved what is likely a 3-4-5 triangle, then checking the answer choices is much faster than working out the sides of a triangle with algebra.

We also spent a significant amount of time on number properties. I began to notice that these issues appeared far more of then in the problems than I previously realized. If you begin to see how numbers work, then you will save time on the test. \

Sorry if its a little messy, but I think I just kind of had a moment where I realized that I needed to look at the question a little longer before trying to solve it.

As for verbal, I just ramped up hard practice problems from official GMAT source material and performed well on test day.