There are many well-documented ways to download/transfer your Google Apps data. To get stuff out of your school Google account Docs/Drive, Picasa, or Contacts, we recommend:
To get a local copy of data in Google Sites, try:
http://code.google.com/p/google-sites-liberation/
To get your old Gmail, the process depends on whether you want it to be transferred to another Gmail account, or just downloaded to your computer, or otherwise. For Gmail-to-Gmail transfer, take a look at:
http://www.howtogeek.com/148036/how-to-migrate-your-google-account-to-a-new-one/
For exporting mail to your own computer, check out:
http://dataliberation.blogspot.com/2009/09/liberate-your-gmail-with-imap-and.html
If you still have questions, please do a Google search for terms like "export data from Google", "migrate Google account", "Google Apps download data", "move email from one Gmail account to another" etc. and you will find a wealth of information.
Source:-- "The Tech People"