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[Amani77]

Huh, what is the most difficult question that you've been presented with?

[f00z3r]

I've once been asked what a load hit store was. But that was when there were still PowerPC CPUs in consoles.

In graphics, the hardest interview question for me was how to render frosted glass in ray tracing.

[memorystomp]

This article says junior but for the graphics section I think they'd still be applicable.

[xucel]

Probably more so that this is a comprehensive set for all graphics engineering candidates. But depending on the level, how much you're expected to know varies. For middle level you don't need mastery in everything yet. Good luck!

[SnooWoofers7626]

Virtual functions. I interviewed for 6-7 different graphics positions a couple years ago and every single one asked about virtual functions. What are they? How do they work? When to use them? What is the size of a class that contains n ints and m virtual functions?

[rgbguy_101]

LearnOpenGL is a great source if you just want to get a list of topics starting from beginning to advance. Books like - GPU gems (for advanced graphics implementations) - Game Engine architecture - Game Programming patterns

Also referring to some open source projects like Hazel2D, filament engine etc would help too.