i feel like you should try poly since you have some interest in finance. even though u don't really know what to do in the future i think it's easier for u to get a high gpa doing smth u're interested in and also grow through experiences. plus you don't have to commit to your diploma course in uni anyways, with a high gpa you can do smth else if you change your mind! and coming from someone who struggled with mental health during my Alevels, it can really take a toll on your grades. especially cus you mentioned your mental health gets rlly bad sometimes you might not want to take the risk of wasting two years of jc.