Hey, its okay. You miss them, and there is nothing wrong about it. I know your thoughts are sometimes not in your control, and trying to stop them can make you feel worse.
But its also important to note that you have an exam tomorrow. So, just let the thought of your ex pass. Don't focus on it. It will come and go. Its okay to feel how you are feeling. Its okay to sometimes remember your ex, but that day isn't today. So let that thought just pass, don't focus on it today, you can think about it another day.
Maybe there is something that is triggering you to think about them. Try not to focus on the triggers, maybe try to listen to some background music and then study. How does that sound?
ok I m trying
class 12th?? well just move on you have to admission in good college. Once you step out in the new life you won't even remember that person.