From a shar'i perspective, it would be wajib for you to listen to your father/mother on this particular matter (where their concern is your own worldly and hereafterly success), in the case where your disobedience would lead them to be upset and annoyed at you.
However, it is understandable that being forced into such a path maybe difficult and against what you would like to achieve. I would suggest you speak to your parents and together decide what is best for you after your A levels. Speaking to a scholar or seeking advise from reliable, wise and pious individuals from your city is also a recommended.
I pray for the best for you