I need to say that, for doing a specific task (such as "calling a customer on the phone") there is a minimum level of education. Currently I say "minimum education" or an "ideal" level.
However, "ideal" is not the word i am looking for, because you might think that "ideal" means the highest possible education.
e.g.
Boss speaking to employee): "Yes, you have the minimum education level but i'd say that for this task the XXXXXX education level is a high school education.