2- Never read the options for a question about which you have no idea . reading the lengthy options and then finding that you cannot attempt will be a disaster.
3- Choose short question ( with short statements) first and finish them quickly then comeback. In one hour you can attempt upto 70 this will give you confidence.
4- Donot waste the time on a question which seem difficult . may be some easier is waiting for you ahead. Remeber you alway can come back if you have spare time.