Hi rtsaito.
It works best to master one topic at a time.
To master a topic
- first, review the relevant concepts and strategies
- then do practice questions involving that topic UNTIMED until you're achieving high accuracy
- finally, work on reducing the time per question until you're correctly answering questions involving that topic at test pace
Then, move on to the next topic and do the same thing.
In other words, rather than learn all the basics and then do practice questions, you could learn the concepts and strategies associated with and practice one topic at a time.
Of course, since you've already learned lot, you won't follow that exact process, but you can basically follow that approach while taking into account what you've already done.
For more in-depth discussion of how to master GMAT quant and verbal, see these posts.
Improving Your Accuracy on the GMATHow to Score High on GMAT Verbal