Are these sentences right?
I felt very nervous during the examination.

Children at school like making a mock of each other.

How much do you earn in a month?

To turn on the computer you must insert plug into a rosette.

Question

Are these sentences right?
I felt very nervous during the examination.

Children at school like making a mock of each other.

How much do you earn in a month?

To turn on the computer you must insert plug into a rosette.

Answer

"Children at school like mocking each other" though it would probably be more natural to say: "children at school like to make fun of each other".
"To turn on the computer, you must insert a/the plug into the rosette" (but by rosette do you mean wall socket?)