No-one is GUARANTEED a place at University.
Universities need to read your Personal Statement (why you want to do this subject, and why you want to study for a degree), read the academic reference from a current teacher, see you predicted exam scores and look at your overall profile.
And if you apply in the same year as you are completing an Access course, then any University that does make you an offer will make it Conditional on a specific graded result from that course.