I don't want to sound mean but don't take it lightly. This should be a lesson and not something to laugh on.
Believe me, getting into a good college is very important. Not only do you get good faculties and facilities but also decent atmosphere. God forbid, if you end up in some not-so-good college you will have to do with that 'class' of people who neither study nor let others study. There won't be much competition. Not enough resources. And so on.. I can say all this by my experience. The biggest mistake of my life - despite being an above-par student through out my life, I ended up in a ████ college and faced all the above things.
So, take it as seriously as you can, these entrance exams are really gonna shape up your future. Just a few months dude, don't let them pass just like that.
MuchMore added 2 Minutes and 24 Seconds later...
On topic, in these entrance exams keep a good eye on clock. Divide time for each section, do not let your ego come in way when stuck on a question, just let it be if you feel it isn't solvable in the time limit you have decided. Go for other questions, there are LOTS of them. Rarely will you be able to attempt all the questions.