Interactive Quiz and linked Questionbank

I currently use a plugin to run quizzes here: https://quizbreak.co.uk/

The plugin, LearnDash, has lots of limitations:
– To enable users to choose a mix of up to six categories I have had to upload hundreds of excel sheets
– If any mistakes are found, I have to reupload all these excel sheets again
– Users don’t always see questions from the categories they have chosen (because questions are chosen at random from the categories chosen, so it is not guaranteed they will get even one of each)
– There are some issues with the content appearing correctly across devices
– Viewing the correct answers after submission is cumbersome
– No decent leader board option – I want people to be able to submit their names and for it to appear in an aesthetically pleasing leader board
– Once a quiz is complete, it doesn’t bring you back to homepage so you can start again

Ideally, I would like one good looking interactive quiz and one database of questions that I would update every so often – along with all the things listed above corrected.