Someone once asked...
Someone answered with kindness...
This is a little difficult because it can depend on what kinds of silly mistakes your making. time constraints are hard, and i would ask if your getting partial credit for work shown? because it can become a game of doing what you know is right, moving on then coming back to finish questions so that you can at least show what you know without rushing through that. other than that i would say you unfortunately need to talk to a real teacher/tutor and be a little vulnerable by showing them where you're getting stuck thats causing you to rush for time, so that they can help you more directly.
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