Personally, I think that’s way more studying than you need to do over half-term. Remember that it is supposed to be a break as well, even if you are encouraged to study during it. I would give yourself a day or two off for a breather (the next few months are going to be intense as it is) or even just cut down your hours each day so it’s not the only thing you’re really doing everyday because I imagine that timetable could get very repetitive after a few days doing nothhing but work. However, it’s your choice and if you feel you could handle that much studying then go for it!