Difference between noda and nanda?

Question:

also what's the difference between gakusei janainda and gakusei nanjanai ?? and is this sentence correct? 8時に起きたいんじゃなかったの i tried to say (lolol) didn't u want to wake up at 8. here's the website where i got this from: http://www.guidetojapanese.org/learn/grammar/nounparticles

Answer:

>difference between noda and nanda?

It depends on context. Please tell us more.

>gakusei janainda

I'm not (or it's not) a student.

>gakusei nanjanai ??

Are you (or is it) a student?

>8時に起きたいんじゃなかったの

This is correct.