uncocky cocker

Someone who, in class, always raises their hand to answer a question and thinks they are 100% right, but it then turns out that they are 100% wrong and the teacher says "kinda" or something other than no to make them think they're right so the cycle repeats.

Teacher: So does anyone know how exactly this formula works?

Uncocky Cocker: Yes! So this number is like the same as the other so they are like linked and it works like that!

Teacher: Almost!