if you already know you want to do law at uni, i would not advise taking law at alevel. most unis would prefer you to have a facilitating subject instead as what's taught in law alevel is pretty much covered in the first term or so at uni so firstly it wont give you the head start you think it will, and some unis would prefer to teach you from scratch as your alevel course might teach it differently to how the uni want you to learn it. subjects such as alevel law and psych have often been criticised for lack of depth and detail in the course
the subjects you have chosen are definitely going to be preferred by unis but it all depends on your grades in these subjects
most unis don't have a preference for either history, so feel free to choose which one interests you or you think you'll do best in