Colds are not fun things to catch when you have to go to school! This is mostly a new experiance for me ( I did have to go the seminary when I had colds but seminary was only one hour, not most of the day!).
A few tips are~

• Get lots of sleep! A few extra hours goes a long way!
• Don't over do it (example: dancing even when you don't feel like it and don't even have to!)
• Drink lots of water! I've noticed that juice [the really stuff, not 10%] tastes really good too!
• Make sure you wash you're hands a lot etc.. so you don't pass it on!
• Think positively!

Anyways, just thought I'd share what was on my mind! ;o)