Endgame Study 12 and 13: Special 100 Views Edition!

Hello all, because I got 100 views on one of my blog posts (endgame study #10) , today we'll have a special edition of endgame studies: we'll have 2! I hope you enjoy solving these!
Note: There will now be 2 hints for each endgame study. Hint #1 is for those who mostly get it but need a SMALL hint, Hint #2 is for those who are completely stuck and need a BIG hint.

Study #12:

Small hint: Keep renewing the threats! Don't let black breathe!

Big hint: You need to win black's queen with your knight. 

Study #13:

Small hint: Get your Queen closer to black's queen, and then check him with your knight!

Big hint: Use a discovered check idea to set up a favorable position!

I hope you enjoyed this special edition!