For autocross, change the engine oil if it hasn't been done recently. Not sure about AT fluid because I've never autocrossed a car with AT. You should be OK with the brake fluid that's in there - for most folks, autocross isn't very demanding on brake fluid (though there are a few exceptions up at the pointy end of that activity).
Norm
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'08 GT coupe 5M (the occasional track toy)
'19 WRX 6M (the family sedan . . . seriously)
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