Hi Schachfreizeit.
The answer to your question depends on your starting point.
If you're already pretty strong in most areas quant, then you could proceed in the following way.
For each quant topic, do a set of practice questions.
- If you get most of them correct, then you can proceed by simply reading the explanations and then doing more of the same type of question until you achieve high accuracy.
- If you get a relatively low percentage correct, then study the concepts and strategies associated with the topic thoroughly before doing more practice questions.
If you are not already strong in most areas of quant, then it will be more efficient to study the concepts and strategies associated with each topic before doing practice questions involving that topic.
For some key insights into how best to practice for the GMAT, see this post.
The Best GMAT Practice Methods _________________