Hii!
Sorry, but your question is quite confusing. Why do you think only you will be the one, alone to reach class 12th? Also, are you talking about cheating and getting caught in the exam? Dont worry about anything like that. Everything will be fine. You just focus on your studies. Also, if you don't score well, you can go for improving or re- exam, if your School/ college provides that option. If you mean to ask something else in the question, kindly restructure your question and do so.
Hope you understand.
Good luck!