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Dear @gggggdsfgr,
Thank you for the topic.
As far as I understand, you want your website visitors to choose the quizzes they want to pass from the front end.
You can check the Category Selective Quiz addon to see whether it meets your requirements or not.
With the help of the addon, your users will be able to choose how many questions from each category they want to answer.
If I understand your request incorrectly, please correct me and clarify your question so that we can guide you accordingly.
Thank you.