I was diagnosed with a disability. Will I automatically be granted accommodations?

No. A diagnosis alone does not qualify you for accommodations. You must adequately document (1) the existence of an impairment that substantially limits a major life activity, (2) the current impact of your impairment and how it affects your ability to take the computer adaptive GMAT exam under standard conditions, and (3) a rationale for why the requested accommodations are appropriate in light of your impairment(s).