Chandan Kumar

I will give the kids tasks after teaching them a few concepts, and we won't move forward until they fully understand them."

More formal (for a school or professional setting): "I will assign tasks to the students after teaching them certain topics, and we will not proceed to the next step until they have grasped the concepts."

Simple and direct: "I will give the kids some tasks after teaching them a few things, and we won't move on until they understand.