standard; level (of ability)
What is his level of English?; What is his standard in English?
You don't have the required standard
They are about level in ability
They're not on the same level at all
Not all the pupils are of the same (academic) standard; Not all the pupils have reached the same (academic) standard; Not all the pupils are of the same level of ability
skillful; talented
This young man is very talented! He's fluent in English and French, even in Chinese!