The official sources every applicant should bookmark. This list names only the organizations that run the process and publish the authoritative data — no commercial prep company gets a "best" badge here.
The official sources
The Association of American Medical Colleges runs the MD application infrastructure and publishes national admissions data. Its site hosts fee assistance, admissions research, and policy updates.
aamc.org →The AAMC's Students, Applicants, and Residents hub: the AMCAS application itself, the application guide, fee assistance program details, the MCAT registration portal, and school-search tools.
students-residents.aamc.org →The AAMC's school-by-school database: entering-class GPA and MCAT medians, mission statements, curricula, and application details. The single most useful school-list tool — subscription-based, worth the price.
MSAR on aamc.org →The American Association of Colleges of Osteopathic Medicine — the DO schools' counterpart to the AAMC. Home of the AACOMAS application, DO-school profiles, and guidance on the osteopathic application essays.
aacom.org →The Texas Medical & Dental Schools Application Service: the common application for Texas public medical schools, with its own timeline, essays, and admissions calendar.
tmdsas.com →The AAMC's MCAT hub: exam content outline, what's on the test, free practice materials including the official practice exams, registration and score reporting. Start here before any commercial product.
MCAT at aamc.org →Commercial MCAT prep companies sell courses, question banks, and tutoring; admissions consultants sell application coaching. This guide takes no position on any of them and endorses none as "best." A few principles to evaluate any of them yourself:
Verify dates and fees yourself. Application fees, MCAT registration fees, and deadlines change. Whenever this guide or anyone else cites a number, check it on the official service site before you plan around it.