Both Graph 1 and Graph 2 are considered correct for exam preparation, but Graph 1 is preferred for sketching due to its use of improper fractions, which provide exact values. Graph 2 offers approximations that are less accurate and should only be used when necessary, such as when drawing on graph paper. The discussion emphasizes the importance of precision in graphing for exams. Overall, using exact values is recommended for clarity and accuracy in exam responses. Proper graphing techniques can significantly impact performance in assessments.