At AKTU, the year-back criteria are pretty simple. You are likely to get a year back in any of the following situations:
If in a single year, you have back 6 subjects
If you score below 30 in 6 subjects in a year
If you fail any practical exam
If you do not appear for a practical exam
If you are accused of UFM or unfair means like cheating to pass an exam
Any of the above situations will result in a year back. Try to avoid this as much as possible because it will become very hectic for you.