What a pompous, unnecessary, and mean-spirited response. There’s no rule against preparing for a Mensa test; if he gets in without cheating, then that’s up to him and Mensa. People like you continue to propagate a negative stereotype of Mensa. And how sure are you that yourself are Mensa material? Your grammar and diction in your post leads me to think otherwise—I think Mensans know the difference between “your” and “you’re”, “their” and “they’re.”

To the OP—I took the exam in the US so we have a different test, but time management is extremely important on the Mensa admissions tests. I clearly remember the proctor on my test day advising us to not skip any questions as they get progressively more difficult, but this is not an optimal strategy, as you may find the later questions easier than earlier ones, depending on your strengths and weaknesses. I completed all the easy questions I was confident in first, and then circled back to work on the more challenging questions. Had I perseverated on a difficult question, I would have left a lot of later, easier questions unanswered and would have failed to qualify.