Unfair exam

Hello, recently I took an exam worth 5% of my grade in each module (three modules in total). I know that isn't much but it is still apart of my final grade and therefore has importance in my eyes. My concern with the exam is that different groups of students are to take the exam at different dates; some sooner than others. How is this fair? Being the first to take the exam I clearly have a higher disadvantage than other groups who are to take it days after me. Furthermore, being in the student group chats, many people have helped each other by sharing the EXACT questions that are on the exam. So now not only does every other group apart from mine, get more time to revise, but they're also getting the exact questions that are on the test days prior to actually sitting it.

I acknowledge that having a large amount of students makes it near impossible for everyone to take the exam at once, but how is this far for people like myself, who had to take the exam first?

EDIT: Should I contact my professor about this complaint or will they simply not care?

@gjd800 @DataVenia
I am debating on writing them an email about the matter, but I do not want to sound like a "grass" :/. How should I word it? "I wanted to let you know that several students shared the quiz answers to those that had yet taken the exam"