Your B-1 extension does not automatically disqualify you from an F-1 visa. There is also no general requirement to wait more than two months after returning to India. Still, these facts alone are not enough to estimate your chances of approval; each application is assessed individually. [State Department visa guidance](https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/visa-denials.html)

The assessment depends on what happened with your extension:

- If USCIS approved it and you left before your extended I-94 expired, the extension itself was not an overstay. Keep your approval notice and proof of departure.
- If you left while it was pending, a timely, non-frivolous application generally prevents unlawful presence from accruing while pending, provided you did not work without authorization. Filing does not mean the extension was approved. Keep your filing receipt, original I-94, application copy and proof of departure.
- If you filed late, received a denial before leaving, or stayed beyond the approved date, the exact dates and reason for denial matter. Have a U.S. immigration attorney review those records before you apply. [USCIS guidance on extensions and unlawful presence](https://www.uscis.gov/sites/default/files/document/memos/revision_redesign_AFM.PDF)

I think a five-month business visit followed by a relatively quick return for study could raise questions about why you needed the extension and when you developed your study plans. That sequence alone does not establish improper intent. Prepare a clear, truthful timeline with records to support it.

For your F-1 application, be ready to explain why the university and course fit your education and career plans, and how you will pay for tuition and living expenses. You should also be able to explain your intention to leave the U.S. after your studies, using your actual circumstances and plans in India to support it.

You will need the university's Form I-20 and the applicable SEVIS fee payment. An admission letter alone is insufficient, and admission does not guarantee visa approval. [Official student-visa requirements](https://travel.state.gov/content/travel/en/us-visas/study/student-visa.html)

Was your extension approved, pending or denied when you left? Did USCIS receive your application before your original I-94 expired? Those details matter more to assessing your risk than the two-month gap.