Always pay full due within due date and forget about CIBIL till this year end (check and view the score only in January).
Before purchasing something, think for a second whether you can pay full in due time or not. Do not opt for EMI, unless its really required and again forgot about CIBIL score till December.
Do not worry about saving interest amount by keeping the amount in savings account, pay as soon as you have money. Doesn't matter when? just pay whenever you have the money and always clear your dues by due date. And mostly, forgot about CIBIL score till December, don't have to check till that time.
No matter whether you use full amount or only half or only 30%, doesn't matter just pay in full by due date and never miss the due date.