Training app

We want to build a app where we can have gas training multiple choice exam papers ( very smilier to the DVLA theory help app )
Learners can get a pass or fail mark, have a list of all the questions they failed
To host a gas rate calculator
Pipe-sizing tool
I appreciate this is all industry specific, we can explain what this is - its pretty simple stuff
To host videos for guidance
A area where learners can email in questions for trainers to reply