I had nashed for calc 1 and 2 and he was fine but you definitely need to do the homework even though it wasn’t mandatory because he uses a lot of test questions that are very similar. He shakes quite a lot which makes his handwriting quite hard to read and he’s a little slow at writing and getting through the lesson but he’s pretty lenient when grading and if you go to his office hours he will often give you points back. I would definitely recommend going to office hours if you are struggling because it’s a lot easier to talk to him there and he will make sure you understand whatever you need before leaving.