The Sciences, as you can see on p.142, fall under the "Knowledges" category, so they're controlled by p.144, saying that any given Science maxes out at Science-6, but that (p.145) they stack with Skills when appropriate.
I see that, but then on the same page falling under the "Knowledges" category by association are Animals, Driver, Heavy Weapons, Pilot, etc. which are all Skills.
The issue I want to drive here is that an Art or Science Major and Minor aren't nearly as useful as say, "Engineer" or "Fighter" -- soft skills like Psychohistory and Physics may stack with other skills, but their game utility is limited and depends heavily on the Referee. There are no game-specific systems that would favor a character having Philosophy-6, for example, unlike Slug Thrower (combat) or Small Craft (vehicle operation).
Having The Sciences max out at 6 is kind of rubbing salt into the wound, too. When someone who grabs say Jump Drives-2 can now pile skills into Engineer and realize a significant synergy bonus because for every point you're putting into Engineer, you're gaining points in M-Drive, Life Support and Power Systems in addition to J-Drive. While the character who graduates with an Honors B.S. in Physics and now has Physics-5 will max his Physics knowledge in the first year into his Master's. He realizes no synergy bonuses at all.
You can game this a bit by switching your Honor's B.S. Major to your Minor in Grad School and then get New Major-3 and (old Major) Minor-1, maxing out your old major at 6 and getting a new one (maybe your old minor?) at 3 (bumping your undergrad Minor to 5). You could then carry this over to a PhD and basically do the same thing, moving your post-grad Major to a Minor and gaining that last point, and adding 3 new points to another knowledge.
What I'm seeing (after donning my Min/Max goggles) is that pre-career education, unless it's a Service Academy, is just a way to start one term behind a character who went straight into a Career. Your best strategy would be to Major in anything that wasn't an Art or Science so that you were Majoring in a Skill rather than a Knowledge. Broker, for instance. At least that way, when you finished your Master's (with honors and an honors B.S.) you'd be Broker-8, and Minor-2, Minor-1, or Minor-3 (depending on your choices).
My thinking was The Arts and The Sciences look kind of like skills. As you progress through pre-career education, and into post-graduate studies, you'd pile those points into the parent skills. This gives a benefit to scholarly-types, allows characters to continue to benefit from gains in Major and Minor (all careers have this in the Skills). Consider the Scholar career for a moment while you're processing this. If a character goes through and gets her PhD, we can assume she's a Major-6, why would she ever roll on the Academic column? Why would any one for that matter?
This is something else I'd like to bring up in the Errata Discussion: What happens when you hit Major-6 before you finish your pre-career education term? Take my Honors B.S. Physics student above as an example.
Also, how long can you stay in school? Can I keep going to grad schools for as long as I keep getting accepted to them?