AITA for intentionally posting the wrong test answers on a cheating website?

BACKSTORY:

I failed my first 400-level physical chemistry test 2 months ago. I barely passed my second one last month.I noticed I scored significantly below class average on both and the curve wasn’t quite what I expected it to be. (That’s ok, labs + hw keep my grade at a high B)

Side Note: The class is about 60 people. Unbeknownst to me, It fills up quickly every semester because people think the professor is ‘easy’. I didn’t know this. The class just fit my schedule and I certainly didn’t think it was ‘easy’ after those 2 exams.

Here’s the catch: Our professor is old and I noticed during exams that many people were suspiciously using their phones. I heard rumors that someone had posted the test questions to a relatively well-known site (it will remain unnamed) and some students had used that to score A’s and B’s. (We can’t really use the site for homework help because of our homework structure, but a lot of us use it for test review & test prep, which is extremely helpful). Our tests are LONG -we get 2 and a half hours for each test- which gives these students plenty of time to post the questions and receive the answers online.

EXAM DAY:

I was EXTREMELY irritated when I heard this. This rage really fueled me and I over-prepared for Test 3. I studied like crazy for it because I felt like these cheating students were robbing me of points from a regular curve. I was able to finish the test in about 45 mins of the given time. I didn’t know everything, but I felt pretty great about what I turned in. I was the second student done with the exam and felt pretty good as I wrapped it up.

Once I finished and began walking out, I looked around and saw a ton of people cheating. I was so angry and so distraught, that I used my free time after the test to go on the site and see if my peers had posted the test questions. Of course they had. I had memorized all of the questions (there was only 6) and found 4 of the questions had been posted online. I answered ALL of them incorrectly, though I made the process look somewhat legitimate. I realized that if I answered those questions first, the real site tutors wouldn’t answer them in the given time (I was right).

PRESENT DAY:

I scored a high B, and the curve put my grade at an A.

I had the fourth-highest score on the exam.

Most students failed, even though I found this test to be much easier and much more manageable than the previous two. I looked at the tests of my peers as we compared results. We always compare the partial-credit points to make sure our grades are fair. I saw that a LOT of them (I’d estimate about 13-15 students based on what I saw ) used the ”fake” methods I had used on those incorrect answers. More students failed this test than the second test, and it was pretty evident that I’d screwed some of the cheating students.

I honestly can’t say I feel bad about what I did. I worked hard, and their lazy efforts directly impacted my GPA and my future.

EDIT: A common argument I see here is “See you studied and did better! Just keep doing that!” I studied like a maniac. I didn’t go out, didn’t attend meetings, just had total focus on this one test. It’s a completely unsustainable level of study and was only possible because I didn’t have much going on in my other classes.