You seem to be assuming that your experience is universal.

Why? I'm assuming that my experience is common, which it is. That's more than enough to disprove the idea "I'm not good enough at doing essay style exams to pass a CS degree". Everyone is that good, because there is no minimum essay-skill requirement to pass a CS degree.

Are you thinking that the only CS degree you could conceivably otherwise have passed also had a strict essay requirement?

What style of CS exams were the ones that you took, multiple choice ?

They were math tests. Commonly proofs. Sometimes things like "calculate the result of this addition in this ALU".

Sometimes also things like "what is the output of a lexer?" ("A stream of tokens."), or "identify the bug in this code snippet".