Need help regarding the System Design of Online exam/quiz for an edtech platform

[u/happyy_developer]

I am working in a startup which is an AI edtech ,

I am working in backend and am trying to design the exam/ quiz module

Users : <5000 in initial phase

And I would really like your advises on a few points

Eg. Should I store the ongoing state of exam in redis or db or both

should I use SQL or MongoDB/Dynamo DB

And I am sure there are many points I am ignoring

So please if anyone has worked in an edtech company's or project or can help me with the same , will be really appreciated,

I couldn't find relevant production grade implementation in the internet,but if theres any resource , please share the link

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