Speaking from experience, dropping from 2U especially at this time isn't a wise decision.
General Maths is easier compared to 2U but you learn different things, I knew people who dropped down from 2U that didn't do that well in the recent general exam because they missed out on a significant portion of the syllabus (we still learn stuff too). A lot of general is consumer maths and fkn wordy, so if you've been in the highest maths class through out high school, it might be a struggle.
Since you're doing okay, I guess you should stay in 2U. If you're struggling you can always get tuition. But I seriously don't recommend dropping down, especially now.