I found the handouts that code.org provided last year extremely helpful for both me to explain virtually and for the students to review. I believe they are in the Create Task heading under lesson 2 or 3 for examples and scored samples for responses 2b, 2c and 2d. They go over the sample, and the score they received. Especially for the Algorithm and Abstraction section. And if they did not get full marks, it mentioned why they did not. It also linked to the student sample.