Heyy Pratyush Pradeep.....
Yes, your previous marksheet is also valid. Both the marksheets are valid as the one you got earlier had a passing certificate and the later one is just an improvement for which you will be provided with only a statement of marks. So when ever submitting your marksheet in college you'll have to submit both of them.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile