Sample 2/3 OR Book 6

Guys, For those of you have done everything please offer your thoughts: I have done: Sample Exams - 1 Mock Exams 1 & 2 Book 6 - I AM, 1 PM, 2AM Now I am sure I can take just one more exam…(or possibly 2) Is it better to go on to the Sample exams, or try to do more book 6. If sample which one? If book 6 which one? Your advise welcome…as we run out of time…