I doubt fortifying magic skill works by giving you more knowledge temporarily, I think it just makes the effects stronger if you already know what you're doing.
I say our goal should be getting the hang of this magic thing. From the guildmaster's reaction, I'd say we could pick it up pretty quick. And if expensive training doesn't work out, well, there are such things as hedge wizards and wild sorcerers who've never been near a school. If some bandit can figure it out, there must be other approaches to magic than advanced mathematics. There's got to be some emotive or intuitive way to do it.
And just sayin', there must be other approaches to alchemy as well, such as the mundane chemical properties of things or distillation of elements not affected by our own bodies. Like, say, you have 2 plants, each containing a relatively non-injurious toxin, but together the two toxins have a synergistic effect, so an alchemist could prepare a poison by using both plants. I mean, you have to wonder how the undead brew their potions if all alchemy comes from Urine. As for plain chemistry, well, damn I wish Wierd Joykill was here...
So, we know the game gets reloaded, so to speak, if WE die. Perhaps it doesn't for the Nerevarine, and perhaps she can't load it at will. We have yet to see confirmation of her menu abilities.
For earning coin, we could just get a job. I'm sure there's plenty of work available that would normally be behind the scenes in the game. With our math skills, we could help with some financial paperwork, perhaps intern for one of the large trading organizations. Even in medieval times, a skilled accountant was much desired, and it doesn't really require knowledge of complex theorems, just massive number crunching. Child's play for our Math student here. Of course, we might easily wind up employed for someone very, very corrupt.
For quick questing rewards, we could just tattle on the Sixth House agents before they actually cause trouble. In every major city, there's at least one person who very soon will put several fellow citizens under Dagoth Ur's spell. We know their names, we know their locations. The Temple will strike swiftly and silently, and need not worry about gangsters. I'm sure they'd be greatful. We should start by telling them to keep a close eye on Hanarai of Ald Ruun.
For the present:
-Turn off phone
-Re-get walking stick
-Rifle through crates for potentially useful items that nobody will miss.