Hi,
I've gone through your requirements, you already have built a quiz application, now you want some help in code to compare the scores between pre-test and the post-test and the tutorial content.
I can do efficiently write PHP or JS scripts to achieve this quickly.
What are you using to store the scores of each test, its in Database or in client side HTML5 storage ? According code can be written to fetch the scores and compare.
Please feel free to check my profiles for my work quality or ask any query in chat.
Thank you