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Was talking to my friend about this the other day in the context of trade school but I think it applies here: you can change careers whenever you want. When we were younger it felt like such a big decision to pick a trade or in this case a major because it seemed like you were locking in for life, but you can just like... go do something else. No one cares. Someone wanted to hire me as an engineer the other day and I struggled to graduate high-school. Education is kind of a shotgun approach. You get a really broad understanding of a lot of thing because your actual job will probably only use a fraction of it and they're trying to prepare you to not be completely lost wherever you end up.
Also old teachers are really lazy and the test is probabaly pretty similar, if not identical, to the one they gave last year. Good to know people a little older or save things for your younger siblings.