Solomon is going to have a bit of a different philosophy for Gabriel's apprenticeship than Carmen does for Lucien, but, as Marko pointed out, while Gabriel won't have much say in things, I want Trogdor to have a chance to speak up.
Because he's training Gabriel not just to be a wizard, but a quaesitor, Solomon will be focusing a good portion of Ganriel's training on more mundane arts than Carmen likely will to make him more well-rounded and a good mundane investigator (as all quaesitor should be. This is a philosophical point for Solomon (and me), but it might mean being a slightly less powerful wizard, so I would like to know your thoughts.
For his training, I like following Carmen's model of 1 season of direct one-on-one study, 1 season of focused study (whether in the librabry or with a tutor), 1 season helping in the lab (or an additional season of focused study if Solomon isn't working in the lab), and 1 free season. The free season will be Winter (so Gabriel and Lucien can get into trouble together), the one-on-one season will be Spring, and the other two will be dependent on what's going on.
Looking through what you initially came up with for his pre-apprenticeship training, I'm interested in changing things a bit, keeping in line with Solomon's philosophy and it flows a bit better in my mind. so, here's my thoughts through 1242:
[size=150]1239[/size] - Gabriel age 12
Winter: enter the saga
Spring: Learn Latin from Silvia (13+5=18 xp in Latin)
Summer: Learn Latin from Silvia (13+5=18 xp in Latin)
Autumn: Learn Latin from Silvia (13+5=18 xp in Latin - down to 9 xp because of max value)
[size=150]1240[/size] - Gabriel age 13
Winter: Learn Artes Liberales from Silvia (12+5=17 xp in Artes Liberales)
Spring: Learn Philosophiae from Silvia (12+5=17 xp in Philosophiae)
Summer: Learn Profession: Scribe from Silvia (12+5=17 xp in Prof: Scribe)
Autumn: Learn Etiquette from Silvia (12+5=17 xp in Etiquette)
[size=150]1241[/size] - Gabriel age 14
Winter: Learn Order of Hermes Lore from Silvia (12+5=17 xp in Order of Hermes Lore)
Spring: Get Arts opened (2 xp in Magic Theory)
Summer: Learn Magic Theory from Silvia (12+5=17 xp in Magic Theory)
Autumn: Learn Magic Lore from Silvia (12+5=17 xp in Magic Lore)
[size=150]1242[/size] - Gabriel age 15
Winter: Learn Area Lore: Andorra from Silvia (12+5= 17, reduced to 15 xp in Area Lore: Andorra)
Spring: Learn Code of Hermes from Solomon (15+5=20 xp in Code of Hermes)
Summer: Study "Correlations and Expansions", Code of Hermes Summa (15 xp in Code of Hermes)
Autumn: Assist Solomon in Lab (2 xp Magic Theory)
[size=150]1243[/size] - Gabriel age 16
Winter: Free Season (no Arts)
Spring: Learn Vim from Solomon (15+5=20 xp in Vim)
Summer: Study "The Magical Art of Magic", Vim Summa (16 xp in Vim)
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1244[/size] - Gabriel age 17
Winter: Free Season (Vim or any non-Arts)
Spring: Learn Intellego from Solomon (15+5=20 xp in Intellego)
Summer: Study "The Virtue of Knowledge", Intellego Summa (13 xp in Intellego)
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1245[/size] - Gabriel age 18
Winter: Free Season (Vim, Intellego, or any non-Arts)
Spring: Learn Mentem from Solomon (15+5=20 xp in Mentem)
Summer: Study "Humanae Menti", Mentem Summa (13 xp in Mentem)
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1246[/size] - Gabriel age 19
Winter: Free Season (Vim, Intellego, Mentem, or any non-Arts)
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1247[/size] - Gabriel age 20
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1248[/size] - Gabriel age 21
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1249[/size] - Gabriel age 22
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1250[/size] - Gabriel age 23
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1251[/size] - Gabriel age 24
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1252[/size] - Gabriel age 25
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1253[/size] - Gabriel age 26
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1254[/size] - Gabriel age 27
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1255[/size] - Gabriel age 28
Winter: Free Season
Spring: 1 on 1 with Solomon
Summer: Focused Study
Autumn: Assist Solomon in Lab / Focused Study
[size=150]1256[/size] - Gabriel age 29
Winter: Gauntlet
Spring:
Summer:
Autumn:
Obviously Solomon sees the Code of Hermes as the most important thing for Gabriel to understand, even before he begins learning his Arts. Those two seasons get him up to a 3, which Solomon is going to be happy with for quite some time. In Autumn of 1242, he is assisting Solomon making an Amulet of Demon Warding for Gabriel. Because of Solomon's issues with demons, he is considered that Sabine or another demon may go after him through Gabriel, so he wants Gabriel to have some level of magical defense when he leaves the protection of the Aegis of the Hearth. This also gives Gabriel early experience in the lab and actually seeing the fruits of that labor.