Questions 1 and 2 can't really be studied for, with the exception of a few small questions which aren't worth many marks.
I'd practice a good few Q3s and notice any patterns/really common short questions, as you only need to answer 10 (any more are a bonus!).
Question 4 is extremely important because the answers you plan for this can also be shortened and used as accounts in questions 5 and 6 if they come up.
To optimise marks in question 6, I'd focus on the sections that come up every year. Part B - Social Change is generally badly answered, so I'd focus on (C) and D(D), particularly as it's the centenary of the Rising and information for C could pop up throughout the exam. Good luck!