There is a improvement exam for the candidates who didn't score well and not satisfied with their marks in board exam in order to improve their marks they apply for improvement exam.they got new marksheet after improvement Which will hold the best Mark's out of two exam in this fresh marksheet. So this will be your final Marksheet and accepted by any university or college.

Also both the Marksheet hold validation in any institute or university you can use both the marksheet . It's up to u, which one you wanna submit.