I'm in the 8th grade I got held back in the 1st grade and I wanted to know what summer stuff I can take to get to my right grade?

Not sure but you could ask your guidance counselor at your school, they would have a better idea. Good luck and do well.

You'll have to learn everything that you learn in the 9th grade. This differs fom district and state so you'll have to find that out on your own. I suggest you take summer and online corses to catch up to them.