What happens if someone misses all exams in a semester in AKTU?

If you have missed all the exams in a semester in AKTU, you can appear for the same again in the next year. If you missed the 1st-semester exams then you are supposed to give them in the 3rd semester. Similarly, if you have missed 2nd-semester exams, have to give them in 4th semester.

All this considered, there is one very important point to know. In order to appear for the missed exam in the second year, you need to get passing marks in the first year (including both 1st and 2nd semesters). Unless you score passing marks you will not be promoted to the next year. You will have to repeat the first year in this case.