I hope this is the right place to ask. Good thing is I have 25 Edu back links now, but the bad is all are nofollow links. I little confused, is it good or bad?
Not good or bad. Not good as in, it won't affect your rankings anywhere. Not bad as in, you still have a link on a .edu site which could give you visitors if anyone clicks the link.
it is still good, nofollow only not passing the PR juice and not being indexed but still help your SERP
It does not matter, as google will see the links are no follow and providing they are not spammy will look favourable on them, but it cannot be used to pass link juice to your site in the hope it will increase PR.