IQ is such a rough measure of intelligence, I don't think it matters. My brother, who has a shockingly high IQ, barely got through college, while I had no problem. Obviously if you have trouble with reading comprehension or basic algebraic formulas, things will be difficult, but an IQ of 100 shouldn't be a barrier. Hard work is a bigger guarantee success than raw intelligence, though you'll want both to break 40. And anyway, past a certain point I find verbal reasoning to be a lot like Russian roulette. Though in English, obviously.