There is nothing as sureshot sample questions but you can do one thing. Solve the previous year papers.
Do all the past 30 year question papers. Go through each one of them along with the theory behind as the same exact questions wouldn't repeat. You need to grasp the question type not the question itself.

Approximately 1 question paper will take 3 hours + 3 hours to study the theory behind them = 6 hours.
So two question paper per day will be 12 hours at length with a gap for break.

This can immensely help you but again is insanely tough to do!