I am not sure if I will be accepted on my chosen course due to my GCSE results?

You still need to enroll at the college as requested, and the admissions staff will let you know if you have a place on your chosen course. If they decide your grades are too low for that course, it is highly likely that they will be able to offer you to start on a lower-level qualification or offer you another course. For example, you might be offered a Level 2 Diploma in Business instead of your original course of Level 3 Diploma in Business, or instead of A levels in science you are offered a Level 3 Diploma in Applied Science. Do not worry as there is a starting point for everyone at college, and there are many different routes into most careers.