Hey Aditya, If you won't give the 12th board exam this year and are going to give it next year then it will be clearly shown in your mark sheet that you have taken a year drop for your boards as every mark sheet has a date of clearing written on it just like your 10th mark sheet was also having a date and session printed on it. It may have some bad effect on some interviews but mostly your board percentage and your way of presenting yourself matters.

Hope you get my point.