Hello, The marksheet of this year is going to indicate the pass or fail status of each subject, when you have passed all the exams next year the mark sheet is not going to bear any extra indications. But the year of completion will indicate that you have taken a backlog. The marksheet providing authority is not with any school, it is with the state board or in central board authority. Being an external or internal student is not going to make a difference in the marksheet. Give your best in the preparation and don't worry about the results.

Best wishes.