How to validate and also check quiz using Javascript?

Question

I'm working on a quiz form where I used "required" of html but it is not working and I'm using js for validation but how to check ans at same time?
After clicking "submit button" I can do only one function.
https://code.sololearn.com/Wf6rQQJztw22/?ref=app

Answer 1

Post your code so we can see what is heppening.

Answer 2

The form is not processed because of the onclick on the submit button.
Removed the onclick="check()" Line 169

Answer 3

Now I posted code see. Tell if you can help me with this.