"勉強した部分はテストに全く出なかった！"
- The stuff I studied wasn't on the test at all!
- The parts I studied weren't on the test.
- Nothing I studied was on the test.
テスト期間中で勉強したのに勉強した箇所は出なかったから点がすごく悪かった。。。
- I studied for the test but the points I studied didn't come out on the test so my score was really bad...
The parts I studied didn't even come out on the test.
For my midterm exam, the parts I studied didn't even come out on the test.
ご質問ありがとうございます。
「勉強した部分はテストに全く出なかった！」は英語で「The parts I studied didn't even come out on the test.」と言います。
もし、具体的に「テスト期間中」と言いたいなら、そうすると、「For my midterm exam, the parts I studied didn't even come out on the test.」になります。
ご参考になれば幸いです。
アメリカ合衆国 
