1) Yes. They do write something like 5 to 9 questions per passage, so two people at different levels could get the same passage with different questions. Yet another reason not to get caught up in all of that annoying detail!
For RC, the questions are grouped according to passage, not difficulty level, so you've already been seeing a mix of easy to hard. For CR, yes, the lower numbers are (relatively speaking) the easier ones and they get harder as you go higher.
Note a couple of things. Your goal is NOT to get everything right; the test doesn't allow that. It will literally just keep giving you harder stuff till it finds your limit, no matter how good you get.
Your goal is to decide where you
do want to spend your time and where you
don't. You're *always* going to have to guess on some questions. You just want to be in charge of the choice as to when and how (vs. being forced to when you run out of time).
So when a new question pops up, bailing on the question is always on the table. You have to ask yourself, "Is this one really the best use of my precious time?"
Next, yes, the harder ones are going to take longer than the easier ones. Part of what you're trying to do when studying the easier-for-you questions is to look for shortcuts and better / faster ways of processing. Don't just do a problem, think "I got it right and I get it" and move on. Learn even more from that problem!!
Read this:
http://www.manhattangmat.com/blog/index ... -the-gmat/Are you analyzing like that when you study?
Next, RC resources:
https://www.manhattangmat.com/blog/inde ... rehension/Pay particular attention to the "what to read and what not to read" lessons. Spend 2 to 3 minutes max reading a passage for the first time. You're going to skip / skim a LOT of stuff! That's okay - you'll go back and learn the details you need later (only after you get questions about those details).