Yes. If there is the same account, then the only thing you can do is to put a password to your content, but cannot avoid others to delete your files. Are you sure is the same account? Does anyone have the SAME PASSWORD? Because in that case one user changing the account's password will leave all the others without access.
Maybe you are all in /home/student/, but they are different accounts. In that case you can change the permissions of /home/student/suresh by using the chmod command. Something like
chmod og-rwx /home/student/suresh
will prevent other to read, write and execute the directory. Yet you can use only og-w to prevent modifications, but allow reading.
Hope it helps...