Your school has an existing process for appealing the school's determination of the violation of academic integrity. Get a copy; study it well; and act quickly to protect your rights to appeal. Deadlines are critical as your rights are e waived if you do not meet the time lines.
Very likely you will need legal counsel for any hope of success. These are difficult cases and the process is not a level playing field.
Your rights and probable outcome are not enhanced or affected by what happened to other students earlier in the program, and none of the timing allegations you raise in your post will matter in the end. What will matter is whether the school has evidence on which to base a finding of breach of academic integrity. This is ordinarily a highly technical issue of legal process and sufficiency of evidence.
The consequences of expulsion are far-ranging and long-term. It will be a sound investment for you to marshall your resources, hire experienced and skilled counsel, and make the best appeal possible under your factual circumstances.
Good luck to you.
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