Selection and Iteration connects to later units in AP Computer Science A. Solid practice now reduces rework when those ideas reappear in combined scenarios.
Control flow: conditionals and loops for algorithm implementation and problem solving. Expect questions involving if, if-else, nested conditionals; for, while, do-while loops and loop invariants; Combining selection and iteration to implement algorithms.
When you miss a question, tag it by skill (vocabulary, calculation, inference). Patterns in your misses show where to reread your notes.
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