Well I suggest looking at potential uni websites (u are interested in) and find out what subjects are needed in the course.
U can also use informed choices by Russell group to see what potential a level combos can take u where
For those 2 I think maths and physics is a good idea maybe even further/double maybe even computer science depending on unis (computer sci idk abt cybersecurity stuff tho)
And astrophysics I'm not sure either but as what I know maths and physics are a good idea. But like I said do check. Also, if you like to take these a levels as well
Hope it gives u some insight xx