What should I do if I fail the first major exam in an engineering course?

Failing the first major exam does not necessarily determine the final result in the course. Review your exam and any feedback, and identify whether the main problems were gaps in understanding, calculation errors, time management, or something else. Check the syllabus for grading rules and any retake or supplementary-exam options, and speak with the instructor or an academic adviser early. Then make a specific plan to address your weaknesses and use academic support if needed.