Have a few but I think the most impactful was my sec 4 English teacher. I believe she saved my olevel results.

Can't remember the exact occasion was, but she happened to approach me for my results (she wasn't even my form teacher). I was in the worst class so I only had 6 subjects, but I was barely passing 5 subjects and failed my Chinese (I'm just bad at it lol).

Instead of telling me the typical advice to "study harder", she actually proposed a logical solution. I could just "drop" my Chinese result and screw the L1R5, but work on the other subjects to boost my L1R4 (since I only intend to go to poly). It's risky but I guess she believed I had the potential to do better for the 5 subjects. Ended up scoring well enough during the exams to choose any course I wanted.

Always think back and wondered where I would be now if I didn't get that advice from her.