Acceptance rates for Jews at top colleges have been declining, as entire categories of applicants have become disfavored by university admissions offices. For religiously observant Jews, there is another problem: Even schools with large numbers of Jewish students may not be viable options. Religious Jews need a critical mass of committed coreligionists on campus for prayer quorums and holiday celebrations. They need kosher food, which many colleges don’t offer. Even if they get a coveted spot at a top school, observant Jews will often face anti-Semitism and find they have to defend themselves against radical ideologies that target their beliefs....