It is never too early to start thinking about University, it is wise to start looking at your options now. Especially if you have a career goal in mind; identifying what qualifications you will need to access a certain university course.
Below are links which you may find useful:
The Russell Group (https://www.russellgroup.ac.uk/) of leading UK universities has published a guide to post-16 subject choices.
Informed Choices (https://www.informedchoices.ac.uk/) was produced in collaboration with the Institute of Career Guidance and is aimed at all students considering A-level and equivalent options. It includes advice on the best subject combinations for a wide range of university courses as well as advice on the best choices if you don’t know what you want to study after school and need to keep your options open.
UCAS (https://www.ucas.com/) is a useful website to explore all University options. Also giving practical advice on applying and a general guide to University.