Would the tutor be able to point out all these small things that would make a major difference on your score? ( For someone such as that doctor guy, he would as he's specifically looking to help students that are already achieving high scores but what if a good student is unable to get such a tutor?)
Isn't accessibility besides the point? I'm just giving an example of a tutor that can help high-scoring students. And yes, he definitely can. He pointed out many mistakes in the work of people who eventually got 45+, including some who got 50.
Would you need to( or know to) question them about every single thing to find it out or would they actually just tell you as you cover the topic?
( I guess this depends on the actual tutor)
You just go through the course entirely, ask the students on what they know, test them to see whether they really do know it, and then point out these small things as you go. That's how most tutors (at this level at least) would teach.
I think for a majority of things, you would be able to find the "correct" way of setting out your work ( following text book examples, study guide examples, teachers advice, notes online etc). What other kinds of small things would you be referring to?
I can comfortably say most people actually don't after having seen my friends' work, and having been a tutor. It's not something people pay much attention to, either in maths/science calculations, or in short answer questions. Other small things include short cuts in Maths, little technicalities in wording to avoid in subjects such as Biology and the things to pay attention to when writing essays in English.
I'm not saying there isn't any benefit of getting a tutor even if you're performing well but I think, it's not very noticeable in most cases.
My original post was kind of referring to sacs, where I found that nothing I learnt outside was really helpful.
You're equating what happened to yourself as what you think would occur in 'most cases'. I'm not sure whether it's just that I had a lucky run with good tutors, but I'm assuming and hope that most people have tutors that actually do the things I've pointed out above. I'm sure plenty of tutors on VN do this.