When you're evaluating the data, you have to look beyond percentage correct—that's still the old school mindset.
In other words, what you describe here isn't actually inconsistent:
In previous CAT got really low accuracy on algebra and numbers (40 and 33%) but average difficulty level of questions attempted were higher compared to day where accuracy increased (50 and 57%) but average difficulty level of questions was low. I am concerned as there isn’t consistency
When the average difficulty was higher, you didn't do as well, so your percentage correct dropped. This makes sense. When the average difficulty was lower, your percentage correct increased. This again makes sense: you're more likely to get easier stuff right and more likely to get harder stuff wrong. So look back at the rest of the data
while taking difficulty level into account.
What that data is telling you is that your fundamentals are okay in both of those areas (yay!), but when you get harder questions, you're struggling. So what is it about those harder questions that you can't do / would need to learn to be able to do *some* of them in future? (Not all: some should be fast guesses. But, to improve your score, you want to improve your ability to handle *some* of the things that you can't handle right now.)
Next, notice that your focus when describing your 640 test was how many times you had to guess and how you got really hard questions...yet you still got a 640! That's what doing well on this test feels like: it feels hard, you have to guess a lot, you see a lot of hard questions...but you make the right executive decisions and so you get a better score. (And you might have done even better by guessing a little sooner on those 4m+ questions...
On your 580 test, you weren't making quite as good decisions (you went >3m on 8 questions and got them all wrong anyway, plus you ran out of time at the end...so you didn't guess as much as you could / should have earlier in the section).
It sounds like mental fatigue also played a factor. IR can be an issue, as you mentioned, and possibly you've also been over-studying? On your first test, you might not have been too burned out yet, but by the time you got to your second test, you might have been a lot more burned out.
So you have part of the answer already: you need to do some work on IR so that it doesn't tire you out so much on the test.
Next, think about your study habits. Are you burning yourself out in general? You had to do IR on the 640 test, too, so why else did you feel so much more exhausted on the 580 test?
And go back to look at the decisions you made on both tests. Where could you have made better decisions? Where should you cut yourself off next time? How will you know, so that you don't spent 3+ minutes again (and get it wrong anyway)!
Finally, among the problems that you got wrong or that you got right but took a bit too much time: look for the low-hanging fruit:
- careless mistakes
- alternative approaches
- problems you could partially do
- explanations that do make sense when you read them
Don't spend a bunch of mental energy banging your head against the wall on problems that you couldn't do at all and for which the explanations don't even make a ton of sense to you. Instead, learn how to guess more quickly on those and move on faster!
Re: your expiring test access, send an email to
gmat@manhattanprep.com to find out what your options are for extending your access. There may be a way to do so without having to pay the full price for them again—I'm just not sure what the procedure is.