Hello,
Yes, you can sit for 2025 board exams as a private candidate, especially if you did not attend the board exams in 2024. A private candidate like you has to apply at the online interface of the website of the board, which releases the application form at the end of the year in December or early January.
Since you've already appeared for the practicals, you might not need to reappear for that one, depending on which board you are governed by. However, you'll need to confirm whether the marks you get for your practicals in 2024 are addable for 2025. Don't forget to tick the right option in the registration form regarding your practicals.
The eligibility criteria include who is a student and has failed or not appeared in the previous year's exam, and you have to submit your registration form before the deadlines provided by the board.
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