It’s very hard to get above 4.3 unless a student takes fewer courses that is typical for today’s HS students.
As for whether the MCA is still capped at 4.2, versus what they report, no one knows. They did report GPAs above 4.2 when the MCA was known to be capped at 4.2. For the purposes of the MCA they just rounded all GPAs above 4.2 down to 4.20.