There are many courses through grade 11-12 that might be useful for your future, but i think english is the most important one. English is a way of communicating. Humans are social creatures so the better your language skills are, the better you are with people which in the end leads to a good job.Another way English will be useful in the future is to communicate with people with ease. Communicating is really important for humans since its what we are basically good at. Since english is very easy and popular in the world, you can talk to most people in the world