Practice on the concept. From the general to particular. Yet we all know that learning always takes place the reverse of this. From the particular to the general. Concepts cannot be 'taught' on schedule.
Concept formation is a generalization process.
Generalization from specific examples. Yesterday I had my regular grade 9 student come in for his weekly tutoring session. At school he has covered solving equations in one variable. He has also covered solving 'formula' for a specified variable. He has also substituted values into formulae.