Make sure you talk to your teachers about whether you are suited to the A Level courses you want to take. You need to choose the best combination of subjects which will give breadth to your studies and support your career plans.
Students hoping to apply for a place on a particular degree course after A Level are advised to choose courses in those subjects currently required by universities. Most universities now have lists of Preferred Subjects for each of their courses. This is particularly important if you are thinking about studying subjects like Mathematics and Engineering, as several of the top universities now require Further Mathematics as well as Mathematics at A Level. You will find this information on university websites.