Alright so this is how I analyze the situation…
50% (120 Questions) of the questions you are pretty sure you got it right…
For the remaining 50% assume that for 25% (60 questions) you know 1 answer that is not right… that increases the probability of getting the right answer to 50% …
and the remaining 25% (60 questions) you have totally no clue so you have a 1/3 chance of getting it right.
So based on my estimation for this exam scenario the expected result should be 70.8%
gawd… I hope I’m right… hahah