Level 4: mixed practice
Each question is one of the four skills of Level 4: a one-step tree, a two-step tree, an American option, or delta and gamma from a tree. As in an exam, you also have to choose the right method. You master the skill when you get three right in a row, with at least one right answer for each of the four.
Mixed practice:
After a wrong answer, the lesson for it is one click away: a one-step tree, two-step trees, American options and delta and gamma.
Concept check: true or false
Exams also ask about ideas, with no numbers. Decide whether each statement is true or false, and you will see why after each answer.