How about doing the test in the reverse order i.e. Try with Qs 50-66 first, then attempt Qs 25-50 and end the test with Qs 1-25?
Are you kidding ?
I thinks the test is not computer adaptive test so try to solve the easiest questions first, mark the questions you cannot answer at first and come back later if you have time
But if you try with the most difficult questions first and what will you do if you get stuck with one of them? I guess you even cannot stay focus ----->