Need strategical help to improve score

Hi all, I am an italian student willing to score a 680-700 to apply to the Masters in Finance offered by LBS, LSE and Hec

Here some info:
- I started my preparation on Dec 26 and so far I've studied roughly for 140 hours
- I've bought Magoosh, seen all the videos and completed almost 1300 questions
- I've bought the free trial of TTP to fill the gaps i thought i had with Quant (Bc Magoosh seemed a little bit outdated)
- I hold an error log where i categorize the questions that i get wrong and solve them again (mostly for Quant)
- My baseline score was 36Q (22% percentile) and 22V (28% percentile)
- My current mock score is 43Q (41% percentile) and 31V (59% percentile)
- I studied far less for Verbal than for Quant (I would say 2/3 Q and 1/3 V)
- I plan to take the online gmat on Feb 2
- I can spend roughly 12 full days till that date (can study up to 8 hours a day without burning out, so other 96 hours)
- I bought the OG and I find that Quant Questions are formulated very differently from those in Magoosh/TTP, and many times I can't begin solving them. On the other hand, I don't find many differences with Verbal (maybe those from Magoosh are more difficult).

Given that, I see no point in continuing with the questions from the Preps and I'd better keep grinding on OG. Do you think I should start solving mixed questions from each section right away or I am better off if I reach before 70-80% (Medium-Difficult) accuracy for each subsection (such as Counting/Sets/Series, Geometry, Equalities/Inequalities/Algebra) BEFORE starting with mixed questions?

Then, do you have any other piece of advice to help this italian guy achieve his target score?
Thanks!
Francesco