For improving quant, you need to see why was the answer wrong, was it a calculation error, careless mistake, conceptual gap, or whatever reason. Write the reasons why you have done a question wrong (and how you can avoid making that same mistake again next time) on a piece of a piece of paper and try to avoid making that mistake again. Keep revising all wrong points every 3-4 days. Also, don’t forget to revise those points a day before exam.
Also, for the coming two weeks try to make your study sessions longer (2.5 to 3 hrs), so that you will get used to keeping focus for a longer time.
Try to give mocks every 3-4 days until exam day.
You can also try to switch the order to solve mocks. Sometimes the order to solve sections matters a lot. For me, i solve DI first (for me DI is tiring & tough) then 10 min break, then Verbal and Quant (which are easier for me and i can maintain focus while doing these sections)
Hope it helps
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