You might be able to claim him for other reasons, but not because he was in the program.
If the support from you was over 1/2 of all his support (including whatever came from him) for the year and his income for the year was $0 or less than $3650, then you probably can claim him, but not because he was in the program.
If the program is through an academic institution that officially classifies him as a "full-time student", and he did not provide 1/2 or more of all his support for the year, then you probably can claim him.
If he is not officially a student and his income was at least $3650, then you cannot claim him.
If he provided at least 1/2 of his own support, then you cannot claim him.