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I agree with Elaina; it's not natural English, and I don't understand what you're trying to say.
"Clever boys were heard" makes sense as a passive-voice sentence = "Clever boys were heard [by someone]" = "[Someone] heard the boys".
But in your sentence "their lessons" doesn't make sense: there is no place for it in either the passive-voice sentence "clever boys were heard [by someone]" or the active-voice equivalent "[Someone] heard the boys", unless you use a preposition or some other connector to link it to the subject/agent ("[[by] Someone]"), the verb ("heard" or "were heard"), or the direct object/patient ("clever boys").
Do you want to try again?
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