Ochem is by far the least covered of the four on the MCAT (i.e., only a handful of questions). It is in the process of being phased out for med school admissions.
Can't argue with you here.
The importance of the prereqs is for MCAT preparation.
Now here's where we part company.
It may well be true that orgo (aka ochem, aka "organic", depending on where you're from
🙂) is not very important for the MCAT. But the prereq courses are NOT just for MCAT prep; the GRADES you get in these courses are seen as a very important barometer of your aptitude for science and ability to handle the med school curriculum.
Having taken both G Chem and orgo, as well as the MCAT, I would consider it absolutely suicidal to attempt orgo before G Chem. (In fact, most colleges won't even allow it. My school wouldn't even let you register for orgo I until you'd completed both semesters of G Chem.) It's true that there isn't a lot of overlap in material between the two courses, but you need to get an overall orientation in chemistry, as well as familiarity with atomic structure, orbitals, valence electrons, etc., in order to have any hope of doing well in orgo.
And not only is the material inherently more challenging in orgo, the workload tends to be much heavier as well. Most premeds find this to be the single most challenging course they take, from a sheer endurance standpoint if nothing else. Why take your hardest course right off the bat, when you're just getting used to taking college science courses, and run the risk of doing badly? You could end up having to retake the class AND have a bad grade marring your record. I really think that would be a foolish risk to take.
Different schools do things differently, but in my 2-year postbacc program, the course sequence went like this:
Year 1 fall: Calc I, Physics I+ lab, G Chem I, G Chem lab [1 sem--can take either fall or spring]
Year 1 spring: Calc II or stats, Physics II + lab, G Chem II
Year 2 fall: Orgo I, Bio I, Orgo lab or Bio lab [1 sem]
Year 2 spring: Orgo II, Bio II, Bio lab or Orgo lab
I thought this sequence made a decent amount of sense conceptually. To me, G Chem and physics have a lot in common, as do orgo and bio. (My school's bio course is very biochem-heavy, so it wouldn't have been wise to take it before getting through the G Chem sequence.)