Don't go to university with the sole intention of studying something solely because you think it'll result in a high paying job. There's no point accruing thousands of debt, to then pursue a career in something you don't enjoy. You'd be dedicating hundreds & hundreds of hours to working, you want to make sure it's something you actually enjoy.
Take the time to go onto a University's undergraduate course list. Scroll down the list, and go onto any of the courses that catch your eye. Look at the sort of thing you'd be studying in that course. Does it interest you? Would you be able to meet the entry requirements? That's what you should be looking at - not what you think might guarantee you a high paying job. Of course going through the list, looking at courses you like, you can see what sort of career you could potentially go into from that degree. But definitely make sure it's something you'd actually enjoy!
If you're still struggling, there's a website called My World of Work which might be useful to you -
https://www.myworldofwork.co.uk ;
You can complete quizzes & it'll offer you job suggestions based off what it feels would suit your personality.
When you look up a job on the site it provides you with the following information;
Key skills you need for the job
What you'd do in that job
Personal qualities
Working Environment - hours, environment, travel
What qualifications you'd need to get there
Average UK Salary range
Employment Status
Related Careers