It seems like you're trying to complete a sentence about someone and his classmates. The correct form would be:

"He as well as his classmates is studying English."

However, note that the verb agreement can sometimes sound awkward in this construction. An alternative way to phrase it could be:

"Both he and his classmates are studying English."

or

"He is studying English, as are his classmates."

These alternatives might sound more natural depending on the context.