I'll say to you this
Don't stick on the same question if it requires more than 5 minutes of your time. Mark the question and write down what page it's on. Proceed on doing the next question.
When you have time, go to your school, show them the question and write down how it's done.
Doing this will maximize your use of time to prepare for the exams.
Of course you can post the q's here or just PM some of the G-nav experts here. Think it was Alex or Keith.