what are some good guitar exercises so that I can get better at hammer-ons?
well playing guitar hero can be difficult. I feel that if you just focus on just the notes and not on the song you can improve your guitar hero playing skills. I hope as of know you have realized that I am completely kidding and you need to understand I know exactly what you are having trouble doing. I will not assist you in any way just to make it funny(only from the outside of the circle) ha ha ha ha ha
Try playing one string notes and then pressing on the same string on higher frets. But don't let your first finger off the string.