just want to know on avg what level of questions are those and will the real gmat hold questions like those or the kinds i see outside the OG
As you noted, there's no real way to answer this. There are very easy and very hard questions and everything in between, and what you see depends entirely on how you're doing, along with some luck.
You do note something interesting though: that, on those questions that are giving you trouble, you narrow to 2 but then pick the wrong one. I assume the right answer is usually one of the 2? (That is, you don't typically narrow it down to 2 wrong answers?)
If that's the case, then this is less about any one question type, and more about very tricky trap answers. Add this to your list of things to study:
1) why was the wrong answer so tempting? why did it look like it might be right? (be as explicit as possible; also, now you know this is not a good reason to pick an answer)
2) why was it actually wrong? what specific words indicate that it is wrong and how did I overlook those clues the first time?
3) why did the right answer seem wrong? what made it so tempting to cross off the right answer? why were those things actually okay; what was my error in thinking that they were wrong? (also, now you know that this is not a good reason to eliminate an answer)
4) why was it actually right?
You're probably already doing #2 and 4, but add 1 and 3. And do this analysis on any hard question, even when you got it right. If you can really understand how the right traps to get people to pick wrong answers and eliminate right answers, you'll be a lot less likely to fall into those traps.
I haven't examined the 800score algorithm - but a 39 raw score doesn't correspond to 83rd percentile, so I'm not sure what's going on there. I've talked to other teachers (whom I trust) who think the questions themselves are decent, but I don't think we know anything about how 800score built the algorithm or anything like that.
So for that, I would do those more as a way to get practice.