In potions class, Snape, the teacher, sends you to get: 
1x Boomslang Skin, 
1x Snake Fangs, 
2x Beetle's Eyes. 
For the Boomslang skin (get this first!), go to Professor Snape's Office-opposite his classroom 
in the dungeons. Go to the picture of a snake on the wall. Click on it in various places and you 
should find the skin. For the Snake fangs, go outside to the Greenhouses and get into a battle. 
If there aren't any snakes here, get into another battle until you find a snake or two in a battle. 
After winning the battle, you should get some snake fangs. Then go down to Hagrid's Hut and talk to 
him. He'll talk to you for a bit and then go into 'the hut'. Next to the top gate into Hagrid's Hut, 
you'll find a bush. Click on this and you'll get some beetle's eyes. In one of the bushes around the 
actual hut you'll find some more beetle's eyes. Then go back up to The greenhouses and you may see 
Prof. Sprout standing outside. If you do, you and speak to her and she'll give you one house point 
for 'pest control'. Then go back to Snape and he'll give you a class list. There's nothing you can 
do to stop him deducting house points! 
Submitted by james.clag at btinternet.com   

When you are in potions and looking for his ingredients they are all in his office (snapes)
Submitted by www.leoparrdess34