The first question in this route is not what score is needed. It is whether the student may use the route at all, and that is settled by rules the student cannot influence.
Eligibility comes first
Access to the international student quota depends on nationality and on where secondary education was completed. Both criteria are defined, and a student either satisfies them or does not.
Preparing for an exam before checking eligibility is the most expensive order to do this in, and it happens often.
The position of Turkish citizens
Turkish citizens are not automatically excluded, and they are not automatically included either. The determining factor is generally where secondary education took place, and dual nationality does not by itself settle it.
Because the details matter and are revised, this is confirmed against the current published conditions rather than from what applied to an older sibling.
The exams used in assessment
Where a student is eligible, universities assess applications using a range of examinations. SAT is widely accepted, and national school leaving examinations, the IB and A Level results appear on many lists.
Each institution publishes which examinations it accepts and at what level. The lists differ, and a student applying to five universities may face five different requirements.
The quota is limited
These are quotas rather than open channels, and the number of places is set in advance. A score that meets the published minimum does not guarantee a place when the quota is oversubscribed.
This is why the published minimum is best read as a floor rather than as a target.
Equivalence is still a separate step
Eligibility for the quota and recognition of the diploma are two different requirements, and both have to be satisfied. Being eligible does not remove the equivalence step.
The right order
Check eligibility, confirm which exams the target institutions accept, set a target score from their published ranges, and start the equivalence process in parallel. Reversing this order is the usual reason a year is lost.