I have completed/done 12th standard at/ in RT college..<br/><br/>here i have 4 questions<br/><br/>1. I have completed 12th standard in RT college..<br/><br/>2. I have completed 12th standard at RT college..<br/><br/>3. I have done 12th standard in RT college..<br/><br/>4. I have done 12th standard at RT college..<br/><br/>are the above all correct? please do clear my doubts<br/><br/>thanks in advance to all the teachers<br/><br/>Regards,<br/><br/>shravan