Need to build up your vocabulary to 6000+ words. Aim for at least 70% correctness in FIB-R, FIB-RW.
RO is one of the hardest questions in PTE, but luckily there are only 2 – 3 questions of it in exam. Thus it won’t affect the overall reading score much. Learn the basic paragraph-sorting tips. It’s good enough if you can score 1 – 2 points per question.
MCQ are not important. Plan well your time and leave enough time for FIB.