What should I do at college to that will benefit me to teach at primary school?

I am currently a year 11 pupil and will be sitting my GCSE next month, I applied to college and got in the one I wanted to go to however I picked a course that I don't want to do so much anymore as it won't benefit me long term. I decided over the last year that I would like to be a primary school teacher but I don't have any idea where to start.

Can anybody tell me what would be best to study at college that will help me when I begin a teaching course possibly in university.

(I am currently on track to getting around 9 GCSE A* - C)

Any national curriculum subjects would help

Things such as Maths, English and Science?