four tests in one course

Can I set up a course with four tests and each of them has different proportion of final score (100%)?I have tried set up the Part 1 test: 20%, Part 2 test: 20%, Part 3 test: 20% and Part 4 test: 40%.After I took all tests and got full marks for each of them, I found that my final score on the result page is 25 not 100.Is anybody knows how can I set up a course like that and get a 100 in the final score column on the result page?Thanks in advance

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