If you don't submit a valid caste certificate by the stipulated deadline (which has already passed since today's date is June 3rd, 2024), your application will most likely be considered under the Open Category (General Category). The MHT CET authorities might allow conditional acceptance if you submit a written undertaking explaining the situation and promising to submit the caste certificate within a specified timeframe (usually after document verification).

https://www.careers360.com/exams/mht-cet

I hope it helps!