First, u will pass the entrance exam, it's not that hard especially if u r a good score student. The reason why u r not doing good in your studies is I think that ur mind is occupied with a lot of things ( most of them which are unnecessary) Marriage? That's ur choice, not anyone's. "Tiny changes bring massive results." U don't have to travel to other countries to enjoy. I mean if u have the money to do that...... But u can enjoy every minute just by thanking God for the place u r in right now.