I co-authored a post on this with fellow AWS Solutions Architect Joshua Kurz. Between us we held 10 active AWS Certifications at the time of writing.
The five tips: (1) Break it down — start with 10 practice questions at a time, not full exams. (2) Use process of elimination to cut through distractor answers quickly. (3) Learn the concepts behind Official Practice Question Set answers, not just the answers themselves. (4) Spend 80% of your time building in AWS and 20% studying — practical experience is irreplaceable. (5) Work backwards — read the last line of each exam question first to anchor what's actually being asked before reading the scenario.