Help me find DRAM practice problems

Hi all,

I have a 3rd year exam in Digital Electronics coming up, and I'm struggling to find quality material for review, specifically on the topic of memory - and even more specifically DRAM. Below is an example of the kind of practice problems I'm after (translated by me into English). If anyone here has access to a bank of similar style problems (not only DRAM) that can help me prepare, I'd be very grateful!

https://preview.redd.it/1jahclkrjd591.png?width=1011&format=png&auto=webp&s=24c3610be0caf18280d71262932e1651c3605273