Best is looking at the degree plan. Because excelling in computer science or Biology will not help much in ETAM.
The main focus should be on M151/M152/CHEM107/CHEM120/PHY206. These all better be “A” so even if less important classes get “B”, the holistic review will favor students with good foundation.
If your student took AP Calculus AB/BC, AP CHEM and AP PHYSIC 1 and got good College Board scores (4 or 5), the ETAM should be very easy. Getting “A” in high school may not be a good indicator because high school can give easy “A”, not all students take the CB tests and most important of all, many teachers do not finish teaching the syllabus required due to weather or other unexpected factors.
Even if not taking the CB test, try doing a practice and see if what the student stands.