I have a friend who messaged me his approach when in an interview process for a certain academic program that accepts multiple students. He is technically competition, and his approach is weak and has flaws/inconsistencies. I can optimize his approach to his application to make him a stronger candidate. Would it be haram to withhold that advice because him and I are technically competing? Although there are multiple spots, there are also multiple candidates.
Any hadith to back this up would be great.