For those who like to leave comments on Google Docs, here is a new add-on called Check Mark. Once activated you can highlight text in Google Docs and a series of buttons will pop up. Each one will add a comment regarding a perticular issue, I included a PDF with the abbreviations. https://chrome.
google.com/webstore/detail/ checkmark/ kfddponboekcbjlhhjinkefjollhhi dp/support
For customized commenting you can use Permanent Clipboard you will be able to right click and select Permanent Clipboard to write quickly pre created comments. You can use Permanent Clipboard anywhere in Google, so for adding comments in report cards this could save you some time.