Do whichever subjects you are best at, and you will enjoy the most. A year or two, at your age, will make absolutely no difference in the long run.
If you have the money available, there is no reason why you can't start flying and work towards your Private Pilots License while you're studying. This is the first step on the way to a commercial license for many people anyway, and is ideally suited for flying at weekends.
FFF
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