You can qualify on the basis of your Military ASVB scores. If you qualified for OSC your score is likely enough to qualify.
When 18 in the Navy at Charleston, I took the battery tests. Scores qualified me for any school the Navy offered, including opportunity for OCS.
I only had a two year active duty commitment and was a stupid 18 y/o. To agree to those schools or OCS would mean extending my enlistment by as much as 4 years. I made the STUPID decision and said “No”. Ended up in V-2 Catapults Division on a carrier. I regret to this day that decision and still wonder how my life would have been different if I’d said “Yes” and gone to OCS.