Also I completed tasks 1-3 correctly (All tests passed), but when I try to sumbit it, I keep recieving 0%
Hi @karibay,
I suggest you click “Open” > “File” > “public_tests.py” and look for the get_best_split_test function that contains the test case responsible for the error. You see that the test case has only 5 data points so it’s completely possible to run through your code on the case in mind or on paper to find out which step went wrong. It is a nice way to debug and being able to debug is important 
Raymond
Thank you for advice. PS solved the problem
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