3 Skills
Finding Your Own Mistake, Not the Answer
Compare working, not answers, and stop at the first line where the two disagree. Everything below it is a consequence.
Steps You Can Reproduce Tomorrow
Reading a worked solution is comprehension; producing one is recall. A cover-and-predict routine that survives the exam.
The Answer to the Problem You Actually Have
The camera solves what it read, not what you wrote. Five characters to check before you trust a single step.