The transition from paper-based testing (like the SAT offers) to testing on a computer for grad school can be challenging. Check out these tips to smooth the path. https://www.collegeconfidential.com/articles/how-to-strategize-for-computer-based-grad-school-testing/
FWIW neither of my kids had any issue transitioning to the computer bases tests (took GMAT and GRE).
Agree. My kid had more trouble with the GRE subject test (paper based) than transitioning to the computer based GRE. She loved that the regular GRE could be scheduled when she wanted, not just on a specific Saturday, too.