Not everyone takes notes, no. If you are already happy with your RC performance, then you don't need to change anything.
If you are not already happy with your RC performance, then we need to talk.
It may still be that you don't need to take notes, but most people will get better if they are doing so -- in the right way, of course.
I actually don't even like to use the phrase "taking notes" any longer, because people often misconstrue what they should be doing. You aren't taking notes the way you did in school. You're not going to come back in 3 weeks and study from these notes again just before the big test.
Rather, you're trying to outline or map out the major messages and where they're located (by paragraph). The latest edition of our books calls this process making a Passage Map instead of taking notes.
The idea is this: the Map is your guide to know where to go quickly when you have to go back into the passage. You're not writing much down; you're writing just enough to know in which paragraph the major messages, examples, etc, are located. That way, you don't have to hunt around as much: you realize you want to know something about why the new theory is better than the old theory, you glance at your map, that was the first thing you wrote down for P3, so now you know you're going to start scanning from the beginning of paragraph 3.
A good Map will do two things for you:
(1) allow you to answer Main Idea questions (if you're done your job on the readthrough, you shouldn't have to re-read anything in the passage to get this)
(2) allow you to know (quickly!) where to go for detail questions
If the Map contains enough information to answer the detail questions, then you're taking notes like you did in school -- that is to say: too much!
I have a question about this:
Then I go to the questions and answer them just out of memory.
Do you mean you remember where to look in the passage and so you go do that? If so, great - maybe you don't need to make a Map.
Or do you mean you answer based upon what you remember from the passage - so you don't go back to the passage at all? If so, not great. I can't tell you the number of mistakes I've made on RC by doing that (and RC is probably my best area on the test).