Need Help Regarding Education Gap and TCS BGC Process

I have an offer letter from TCS. There is an education gap between my 12th and Bachelor’s (from March 2018 to June 2020) because I initially opted for a different stream, but had to drop it due to financial issues. I had mentioned this gap in my application.

However, while filling out the application, the start date for my Bachelor’s was automatically set to 01/01/2020, and I didn’t notice it at the time. I cleared NQT, got shortlisted, and during the interview, I was asked about the gap. I explained the situation honestly, and I received the offer. I also appeared for the offer upgrade exam, got shortlisted again, and it was only after the upgraded interview that I realized the Bachelor’s start date was incorrect.

Now, my actual education gap is slightly more than 2 years (March 2018 to June 2020), and I’m worried about the background check (BGC) process.

Should I: 1. Stick to the old dates as per the application? 2. Submit the correct dates and provide a gap affidavit explaining the situation?

I’m genuinely worried, as I don’t have any other offer and I’m completely dependent on this TCS opportunity. Has anyone faced a similar situation? Will this affect my offer?

Any guidance would be really appreciated.