Apostrophe is used to indicate possession, to show removed letters, and to make contractions.

Like:

Amigo's dream is to be CSP.
To be CSP is dream of Amigo.

When there is one person, we give Apostrophe before S and when there are more than one, we give apostrophe after S.

Like:

I have student's ticket. "Ek student hai."
I have students' tickets. "Bohat students hain."

See this too.

Amigo's and Zuhaib's dream is to be CSP. It is wrong.

Amigo and Zuhaib's dream is to be CSP.

Use of apostrophe in contractions is common.

I'm=I am
Can't=Cannot
Don't=Do not
It's= It is
He'd= He had or He would

Hope, It will be helpful.