Currently Aryan and Veena are fighting each other while Sam is present there to guide them. It has already been 5 days since they started their training like this. After becoming level 19 Warrior both of them take some time to adjust themselves with their new power.
Good thing is that Sam did not instantly Max out the overall status of his students for level 19. He did that slowly so that both of the students can feel both of them getting powerful because of their own training.
On the other hand, even though he did not use any experience points to increase the level of their techniques, you can say after fighting those robots both of the students are getting more experience points in their techniques.
First of all, fighting those robots became difficult for both of them. Also Sam set the power level of the robot to Beginner Mortal grade. Because of this, both of them have that much difficulty fighting with them.