I suggest self study for USCG engineer exams. Nearly all the exam bank questions are floating around in public domain. Study them, pass the test.
The engineering exams are purely a formality and pointless anyway; it does not in any way evaluate competence. Though, I guess it does act to prevent the truly clueless/low info from obtaining a license…said another way, if you truly can’t pass it, you literally can’t read or comprehend anything.