Review on 🧾 Efficient Testing with 2020-C Compatible Testing Sheets, PDP-12020 (100/pkg) by John Hall

I bought this to test my students. It displayed wrong answers, but unlike other brands I couldn't figure out how to get it to print the correct answer. If anyone can do this please let me know how. Many Thanks. I need 20 answers, not the usual 15. Update: if you black out where the number 2 should be on the key line (to the left of the "key" where the t/fs are) you can trick scantron into printing the answers! Works every time.