I advise you take all four (maths, physics, chem and history) then do an AS in history as universities look for students that have subjects that link together. If you were to take just maths, chem and history, you will not look as competitive compared to someone who took maths, physics and chem however these three subjects I think are the hardest three subjects you can have at A Level but the topics links so well e.g for maths there is mechanics and in physics there mechanics and further mechanics. If you love maths then this would be great, however Physics in my case is my hardest a level so far you just need to always need to be on top of work. Also uni's advise you take 3 A Levels instead of 4 if you take 4 you dont really have any advantage.