Thanks for posting @sprince! I’m an educator myself, and while we use Moodle, this type of question is common in our LMS as well. We would be very interested in using this app, and I’m happy to help along the way.
As @alcampopiano recommended, it is a good idea to break it up into smaller pieces. Once you get started if you run into issues please post and I’m sure we will be able to help.
One recommendation I would have for now is to get code working locally with the available packages in Anvil. Then port your solution over to the web app. The actual spreadsheet manipulation will be hard to iteratively code using only the Anvil IDE.