Unfortunately not. See the criteria of BITSAT for admission into various camouses of BITS Pilani is that you should have given your class XIIth examination not before than 2 years from the date of the BITSAT.

For example if you have cleared your class XII in 2018, then you can appear for BITSAT 2018 and 2019, dual dropper means that you want to attempt the exam in 2020, which is not acceptable.

Hope I have answered your question. All the best!