Clarinet - Can't play C, B notes?
 

I can play higher notes than these, but these two are the hardest, and I'm a beginner clarinetist. I heard a lot of people have trouble with these notes, so I was wondering what I could do to play them, yeah I know PRACTICE! But can I have some ADVICE that would help?

What size reed are you using?

Um...
 

I'm not sure, my teacher just handed me one, since I'm new, I'm guessing its 3.

you should be on a smaller sized reed I think, I began on a 2, I've been playing for 9 years now and I only play on a 3 or 3 and a half depending on the brand.

I always found angling the clarinet so that it's a little more vertical helps, but that's just me.

Also make sure you have a really firm embouchure.

Hope this helps!