Sentence correction: He was deported from the University for allegedly copied...

[Pavanhotscan]

HI ,

1) He was deported from the University for allegedly copied the paper from the other person in the examination hall .

2) He persuaded me that he was helping me but whenever i needed any help he didn't give any co-operation to me .

3)when i was studying in B.tech, I scolded one of my lectures, then i was caught by some other person and confessed my mistake, even they had given punishment to me and my friends.

Does the above sentences contain any grammatical or punctuation mistakes ?

Regards
Pavan

[Mister Micawber]

.
Yes, many:

1) He was expelled from the university for allegedly copying the paper from another person in the examination hall.

2) He persuaded me that he was helping me, but whenever I needed any help he didn't co-operate.

3) When I was studying at B Tech, I scolded one of my lecturers. Then I was caught by another person and confessed my mistake, so (?) they punished me and my friends.
.
_________________
Native English teacher at Mister Micawber's