Neeed help

Bhayia i just started giving mocks and scored very low marks in it i was not able to solve the ques i knew from which chapter they were but i was not able to recall the concepts nd formula while solving them . My syllabus is completed all i need is practise

But im confused on where to start which topic should i pick first beuz i feel like i have forgotten alot of things and plz also tell how frequently should i give mocks ( i have purachased aceipm and afterboards)

And should i practise mix ques or rn focus on conceptual clarity of a specific chapter?