My family discourages all the girls from marrying before at least 23/24. I remember before that my Mum would say a straight 'no' to anyone that asked, regardless of how educated/well-off/good-looking he was. I know a lot of girls do study after marriage but my parents always thought the extra pressure would make it harder.
My brother's only a junior doctor (28) and he's marring next spring and is busy with all the wedding prep but both Mum and Dad are furious cos so much of the time he should be studying (he has exams in Nov, the week before the 'official' engagement) he's looking at wedding venues/clothes/ring/new flat/dowry. He actually failed his last exam and their convinced it's to do with the engagement/wedding and the hospital that is employing him has said that as it's such a prestigious place if he fails again they'll just get rid of him. Some ppl do manage marriage and study just fine but me I'd never be able to juggle those two things effectively..