DS 160Mistake

I have done with B1 VISA interview and got 221G white to submit CV and Transcripts.
While sending those I realized,there was a mistake in DS 160 of My higher educational studies duration (2015-2017) but it should be (2013-2015).

I received convocation on Feb 2017
Please help me out is there any chance to change or any way to inform to US Consulate

Call them and ask. I think once it is processed, it is done, nothing can be done about it.

I know that you can always change before the interview. Any change can be made only in a new DS160, which will result in entirely new DS160 number.