It's generally a good idea to do a little bit of everything every week. Even if you need to focus much more attention on one section than the other, don't ignore your stronger section!

Schools mostly care about your overall score, not your breakdown between quant and verbal. So let's say that you've raised your quant score, but need to work a lot more on verbal to bring it up. Well... unless you're already at a 51, it behooves you to try to increase your quant score at the same time!

Just because you've finished a checklist within a given curriculum, that doesn't mean you're "finished" with any topic. You should be going back and redoing problems you got wrong, doing new problems from the OG or GMATPrep question banks, etc.