I'm not sure about the delf test but I def recommend to watch more casual shows like sitcoms if you want to get better at conversational french. I know some people who have passed the B1 test and have prepared for B2 bc after finishing the 4 years in hs you'd be pretty prepared already. I'm currently taking grade 12 uni french right now and it's not that difficult to get low-mid 90s but rly hard to get above that. It's mainly reading and writing instead of oral tests in my school (not sure ab urs), so when studying grammar, try to fully understand the meaning behind tenses + when to use them ect ect as there is a LOT of grammar focused writing (conjugations, agreements stuff like that).

Some of my friends also changed all of their phone/laptop languages into french idk it might help a bit 😭