Hello there,
According to BITS PILANI, the eligibility for the question is if you are repe ating 12th exam, you should do it for all the subjects to pass 12th again as mentioned in the BITSAT brochure. If you take improvement exams in PCM/PCB only or only in few subject/s, you are not eligible.
To get more information, kindly look into BITS PILANI Brochure.
https://www.bitsadmission.com/bitsatfaq.aspx#:~:text=Am%20I%20eligible%20if%20I,mentioned%20in%20the%20BITSAT%20brochure.
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