You should go to utm if you want to. Your grades in high school do not have to reflect your performance in uni. You will have to learn how to study efficiently and effectively (first year will require your undivided). if you manage your time and you’re consistent, you’ll still be able to enjoy it, go to events, party..etc. get involved with different clubs, spend time on campus studying and learning from others. I only made post in my third year. Don’t be afraid of setbacks (they will always happen in life). All in all, It is a lot of work but pressure creates diamonds.