I am trying to build a flow for my students, whereas if a student says Hi, then it will start asking Multiple Choice Questions, based on the answer, the bot will reply whether it is a correct answer or wrong answer.

I have 200 questions in a flow.

Suppose the user answers 20 questions on the first day and doesn't respond on that day. The session expired. The next day, when he says Hi, it should start with the 21st Question and then return to the 1st question.

How this can be achieved in WhatsApp Bot flows.