[Deformat]

...in the past 2 days by, like....11 guys in my class. Out of which 3 of them are the most annoying.

Stuff like throwing food at me/wetting my rucksack and so on.

Any idea on getting some sort of advantage on them?

[Zen]

never had that sort of bullying. telling a teacher and having some witnesses willing to back your story up seems like the most suitable way of going about things but that could also lead to worse bullying in private. course if you do nuthin it will either still get worse or at least continue. cant really think of any other appropriate methods of dealing with them but people on this site respond fasdt and in great #s so there should be some more advice soon

[AccessDenied]

Pranks go too far sometimes and this is just bad. Talk to your head teacher. Ask them advice on how best you can deal with them, rather than complain. By asking the teacher this way, you are also alerting them of what these cruel people are doing, so the teacher could deal with them.

[Arcanum]

When faced against bullying, your worst mistake is to remain quiet. Asking someone for help is not a sign of weakness, but rather the contrary. It takes courage to say "I will stop this".

Like the above posters say, telling a trusted teacher is a priority (+rep for them), but tell the teacher how you feel, don't complain or be rude. Remain calm.
Another thing you can do is to stick up for yourself. Don't let yourself be degraded as a person just because they bully you. You're better than them, stand your feat, don't remain quiet.

Best of luck on this

[Slightly]

Stick up for yourself and don't let it happen.

Tell them to stop, and be firm about it... but DON'T get angry. If you get angry, they will have won. If nothing changes, you should go to a teacher and let them know what's happening. It's not alright to be picked on or bullied. Be strong.

[David-]

Stand up for yourself. There are times where by standing up for yourself, will cause the bully to back off. (Unfortunately, they usually end up finding someone else to pick on.)

And go to a teacher... As someone has already mentioned, "do not remain quiet".

[Deformat]

Problem is that IMO teachers make the situation worse.

Note: I'm in Highschool, so...

[Individuality]

Just ask them what there problem is, approach them directly and talk the situation out.

If that fails throw stuff back at them