I feel like when i am going the "you try" between lessons or even the mixed drills within the lessons, 97% of the time get them right, but when I do an entire section, I go back to 50%. Is this cause I have been set up for success on the "You Try" questions or its it cause I am not rushed or fatugied.

It gets me down bc the lessons make me feel like i am grasping and getting better but when I go test myself, I am back down. Is this common? How should I overcome this?