I'm slightly comfused. Data is data. Why would it differ if you jump to Smart ? Unless Globe is messing about with your actual usage e.g. used 3gb but Globe is reporting you've used 3.5gb. Also check if you have apps that uses data much in the background. Changing network will not improve the...
I agree with boomboomroom on the technique on how to approach the questions. I've read these posts at the time and really helped me. Not sure what to suggest about last minute reading, you would probably know better. In my case, for example, I didn't do that great in the PMP practice exam, so...