I sat the exam in August. About being mentally drained by the 3 rd section this was not the case in my exam as you have 2hrs to finish what takes 45 min if you know your information. The 2nd is a killer and be sure not to run out of time, there was a 5 point question in my section 2 exam which was an echo question. Surprisingly there where not that many echo in part 2 also there was a few PNR and ETP. Also I personally and surprisingly came close to running out of time in section 1.
Like the previous guy said plenty of practise exams, this cannot be overstated.
The real key to passing the exam in general is exam technique so particularly with all of section 2 work backwards by plugging the answer from the tree into the question and see if it fits rather than waist precious time working through the whole question, practise doing this with the practise exams.
Remember by the time you have entered the exam room you are not trying to further your education you are there to pass a hard exam so Practise exams and time reduction.
Good Luck