I am from the TFIP 2022 DA batch.
I prepared by taking the Vertical Institute Data Analytics Bootcamp which is also under IBF. Subsidized by IBF also. It was really quite helpful because the interviewer for TFIP specifically asked me about that bootcamp experience, and I could share some basic knowledge for the technical questions about SQL, Tableau. Also the fact that you take an IBF course I think shows sincerity in willing to learn when applying for the TFIP in my opinion.
For the assessment (if you haven't already completed), do prepare a piece of a paper, pen and calculator as there will be some math questions. There are 25 or 26 questions, 1 hour to complete. You can also prepare by doing some DA assessment quizzes online. Good luck!