**A B-1 extension does not automatically disqualify you from an F-1 visa.** Applying two months after returning to India is also not, by itself, a ground for refusal. However, nobody can give a reliable approval percentage from these details.

The most important missing detail is **whether USCIS approved your extension or it was still pending when you left**:

- **Approved, and you departed within the extended period:** That supports your explanation that you complied with your authorized stay.
- **Still pending when you departed:** A timely, nonfrivolous extension application can protect you from certain overstay consequences, subject to conditions such as no unauthorized employment. Keep the filing receipt and proof of departure.
- **Denied before departure, filed late, or you stayed beyond the approved date:** Have a U.S. immigration lawyer review the dates and notices before applying.

Your I-94 and USCIS records determine the relevant dates. Merely requesting three additional months does not establish that USCIS granted them. See the [State Department’s extension and overstay guidance](https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/visa-expiration-date.html) and [consular guidance on pending extensions](https://fam.state.gov/fam/09FAM/09FAM030201.html).

For the interview, I would expect questions about why your business visit lasted five months, why you needed the extension, and how your decision to study developed. That is a practical assessment, not a prediction of refusal. Prepare a truthful, consistent timeline, supported by your business-trip documents, extension receipt or approval, and departure records.

Your F-1 application must also establish a credible study plan, sufficient funding, and your present intent to leave the United States after your studies. University admission is one part of that assessment; you also need the school’s Form I-20 and the other application requirements. See the [official student-visa guidance](https://travel.state.gov/content/travel/en/us-visas/study/student-visa.html).

**Was your extension approved, pending, or denied when you departed—and did USCIS receive it before your original I-94 expired?** Those facts would make the risk assessment much more specific.