Very hard to apply %ages to this, actually its not a good idea. From what I understand its more like this.
Q1=.5 points
Q2= 1 point
Q3=.5 points
Q4= 2 points
In the example above, as a real quick and dirty example, the entire testlet is worth a total of 4 points. However getting 75% of the questions correct, if that 75% HAPPENED to be Questions 1-3 would yield the same score (2 points) as if you got 25% of the questions correct, so long as that 25% HAPPENED to be question 4. Or 75% of the questions could yield a score of 3.5.
So I'd toss any notion of % of questions answered correctly because you have no idea how each question is weighted. One would assume in the scenario above that Q4 is considered the most difficult of the 4 questions but what if you happen to be very proficient in that topic,it won't be the hardest for YOU, in fact you may consider Q4 to be the easiest and Q1 to be a bear.
Supposedly testlets one and three are always medium, only 2 can be “hard” which presumably means you need to get less questions correct to achieve the max points because the value assigned to a hard question would be higher than the value assigned to a medium question.
I say ignore what % of questions you got right and try to identify your weak vs. strong topics to study more efficiently
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