Google Docs allows easy sharing of documents. This can allow others to edit
documents from wherever they have internet access. It can also be used to submit
drafts to teachers and pass in assignments.
To share a Google Doc on an iPad, click the upper right hand corner to find an icon that looks like a person. Once you've clicked that you can add Google Plus contacts and email addresses into the document.
The creator of the document can give each invited contact specialized access. Specialized access can be given on a wide spectrum, from editing which gives full access to changes in the document to viewing which allows only viewing.