Q 204: Is there an inexpensive way for a wizard to be able to consistently make a DC 25 intelligence check?
Rerolls should help a lot.
So, get a friendly cleric to cast benediction (Complete Champion 116) on you a lot? Still, that doesn't guarantee success unless the DM house-rules that 19 rerolls can be spent to take 20 with no time increase.
Unfortunately, you can only have 1 Benediction on you at a time since spells don't stack with themselves. But you can combine it with Insight of Good Fortune, which lets you roll twice. So that a double roll, and then a reroll. If your friends prepare Alter Fortune (xp cost) too, you can have quite a few tries.
However, you'll still need at least a +5 int mod for the check, which is probably the toughest if you're not of the appropriate class.
If you're an Illumian with the proper sigil or have a Marshal with Motivate Intelligence, you'll be doing a little better on these checks. Fox's Cunning or some int boosting item would help too.