In that case I would recommend TTP, the one I paid. The chapters in quant are long but they explain really well the best method to approach almost all quant problems, that will improve your DI accuracy. However, I have heard that
magoosh is better for non english speakers regarding the verbal. Anyway, I would you recommend you to use something like Geminis deep search chat to ask for a research about the gmat focus and the general information you need to know for each section. After that, use the 5 days free option that each programs offer (ttp,
magoosh, egmat, etc) and try a little bit each and pay for the one you liked the most.
Spend a month or two reading the chapters and understading the math, not just knowing the formulas. I guess that most of that you already studied at uni so maybe you will understard it easier than you think. And then just focus on practicing two section per day. For example, today I did 23 question of verbal plus 20 of DI with a timer
That works for me
And I went from having 575 on my first mock to 685 on third mock.