The easy hack I noticed.
If you book the same subject at same day with different slot.
Like your friend have booked a subject at 8:30am to 11:30am slot. You have to book at 12:00 noon to 3:00pm slot.
And you are done. You both will have 100% same questions.
Now you can ask all the questions from your friend when he comes out. And you will have 30 minutes time to revise and remember them.
Hope this answer not reaches the university by any ways.