So I need a rec ether for a summer camp, but he letter has to be from a science teacher specifically. As a junior, I’ve taken bio, chem and bio again. He only relationship u have with my chem teacher is that Ihe knows my name 
. But I have had the same teacher for both bio classes. He knows who I am and I can talk to him but I don’t really do much to get closer with him. There are definitely kids he knows more than me and I’m not sure what to do, to get his letter, should I just wait until a few weeks before the letter a due and until that time try and talk to him as much as possible? If so, what should I do because he’s kind of hard to have just a conversation with. And help would be appreciated.
If you decide to wait, talk to him about parts of the material that interest you or connect to your other classes.