Tadaaam!

Ohh! I just LOOOVEEEE my health problems! :D :D Always there when I need them! :D My body doesn't really like school so it gets sick very fast! AWEEEEEESOOOMEEE

But I need it for more time! It's getting shorter... & because here's a system in which if you have been absent for more than 40% of a single subject, you'll have problems getting into next class :\ 
Soo let me give you some tips to act sick at school:

Step #1 Act sick & say that you have a headache as soon as you get to school (at first tell it only to your BF)

Step #2 When your friend tells you to go to the doctor loud enough for teacher to hear, say that you'll endure the pain.

Step #3 crumble your eyes to seem painful 

Step #4 when teacher offers you to go to the doctor too, at first refuse, then moan and let your friend take you to the docs room

Step #5 start talking quietly & with tremor

Step #6 of course symptoms! you can choose between: 1. shiver, cold fingertips & headache
2. head spin, headache and eyes hurting
3. nausea, liver hurt & head spin
4. cough, sore-throat, headache & shiver
5. stomach-ache of course!
These are the most symptoms I have & if you use 1,2,4 you can get out of class for 10 minutes instantly! :D It's your parents decision will they take you home or not, but this also gives you ability of not-attending some boring classes!
*this is all of my personal experience & I was really sick doing that, so if it won't work with you, it'll not be my fault :D*