I love it when people are condescending and wrong :D
INT max spell lvl - spells per lvl - learning success rate - lore bonus
17 8th 14 75% +7
18 9th 18 85% +10
19 9th 99 95% +12
So with your 17 INT mage, you have 25% chances of failure while trying to learn a spell from a scroll, wasting it.
Maximum of 14 spells per level and less lore.
Also, don't brag because +1 INT is actually free, it's extremely fast and easy, like 30/60 seconds to get a decent roll with max DEX INT and a good constitution with no negative scores and even some STR for carrying capabilities and some CHA.
Last but not least, only retards and casuals go straight mages in BG 1, what you do is:
- Gnome Illusionist/thief (19 INT)
- Whatever Conjurer
- Any other specialist that's not a diviner
- At least a dual class High HP up until level 7 which turn into a mage later.
- Another multi-class
Because specialists gets +1 spell slot per spell level and +2 to DC of their favorite school.
Second best thing is multi or dual class because of BG 1 xp limit.