An income certificate is an important document for the registration of a PMSSS scholarship. AICTE has notified that the income of families having less than 8 lakhs per year are only eligible to apply for the scholarship. Usually, the income certificate should be new and not less than a year old if it is 6 months old then it can also work.
The income certificate is checked at the time of document verification. Any mistake can be told to them but be ready with an Affidavit so that you can prove your point. What mistake you have done, which date do you have written ?