For the record, I get the impression that Unis prefer History over English because of weighing the evidence, although both are useful.
Law AS/A2 is a bit of controversial area. Some Unis turn their noses up at it, and for no good reason IMHO, but then again I took it and think it was one of the best things I ever did.
Don't overwork yourself too much. Three solid A2s are the most important component of your university application, taking an extra A2 or AS here or there could maybe give you extra security, but if you take too many subjects then you may end up too stressed and not perform at your best.