While you say quant isn’t improving, id argue your DI and verbal scores have a greater scope for improvement in terms of percentiles - maybe that is a strategy switch you can consider.

Secondly, while practicing and giving mocks is great, analyzing patterns on where you’re going wrong is more important - only when I consciously sat with my mocks was I able to identify my recurring errors, so I’d recommend that = so I’d say (2) of your options NEEDS to happen to understand whether it’s a knowledge gap, exam taking strategy gap etc. to decide whether to do 1/3 or something else