A. When do you have P.E class?

I have P.E class on Monday and Friday. ​(Capitalization)

B. Thank you. ✔ / Thanks.​

​

  Can I help me?     /    Can you help me?​

=> Corrected : The sentence is corrected grammatically. 

​

    Sure.                 /      Sure, I can​. 

=> Another way: Your sentence is okay and this is another way of saying it.​