How do you manage learning so many tenses?
Practice suing those tenses in speech and writing when you can. If you get it wrong, don't worry! As long as you keep practising using those tenses, you'll be confident in using and manipulating those tenses quite easily like you do in English. It's okay if it takes a while for you to get a hang on them. As long as you practice them regularly, you'll get better before you know it.
LB
Related French A Level answers
All answers ▸What is the difference between using depuis/pendant/pour in French when saying for?
How do I know when to use the subjunctive mood, and how do I know when to use the indicative?
How do you form the future indicative tense with regular verbs?
How do you know whether to use the imperfect or perfect tense?