Please help me to correct these sentences

I hereby authorize my brother Paul Vincent to act as my representative and collect my daughter, Helen's certificate and mark list for me from your school.

Please find enclosed the copy of Paul's ID, which you may use to confirm identity when he arrives to collect the transfer certificate and mark list.

My daughter, Helen is in Grade VIII who is currently attending annual examination.

Because of personal reasons and unavoidable circumstances, we will be relocating to our hometown by 20^th March.

We hereby request you to issue a transfer certificate and mark list to enable her to continue her studies in our hometown.