We have made many changes in vQuiz code. How I should upgrade 2.9.7 to 2.9.11?

We had to remove TinyMCE editor script on click Create Group.

How did we do this?

Some changes we have made earlier on your site are not included in latest version, because we made them only for you. For ex: Text Area instead of editor, trimming quiz name(we have set it for 50 chars), rating column.

We have made many changes in vQuiz code. How I should upgrade 2.9.7 to 2.9.11? Should the same amount of work by changing the code be done?