Yes, candidates with a backlog or supplementary exam pending in their educational qualification can apply for the NABARD Grade B Exam. The eligibility criteria for the NABARD Grade B Exam does not specifically mention the disqualification of candidates with backlogs or supplementary exams pending. However, it is important to note that candidates need to fulfill certain educational qualifications to be eligible for the exam. Let's discuss the details below:

Eligibility Criteria
To be eligible for the NABARD Grade B Exam, candidates must fulfill the following educational qualifications:

1. Bachelor's Degree: Candidates should possess a Bachelor's degree in any discipline from a recognized university or institution.

2. Specific Educational Requirements: In addition to the Bachelor's degree, candidates applying for specific posts under the NABARD Grade B Exam may be required to fulfill certain educational requirements. For example, candidates applying for the post of Manager (RDBS) need to have a specific educational background in agriculture, animal husbandry, forestry, etc.

Pending Backlogs or Supplementary Exams
Candidates with backlogs or supplementary exams pending in their educational qualification can still apply for the NABARD Grade B Exam. The eligibility criteria only mention the requirement of a Bachelor's degree, and it does not specify any restrictions regarding pending exams, backlogs, or supplementary exams.

Document Verification
It is important to note that during the document verification process, candidates will be required to submit their educational certificates and mark sheets. In case a candidate is selected for the NABARD Grade B Exam, they will need to clear their pending exams or backlogs before the completion of the document verification process.

Conclusion
Candidates with backlogs or supplementary exams pending in their educational qualification can apply for the NABARD Grade B Exam. However, it is essential to clear the pending exams or backlogs before the completion of the document verification process. It is advisable for candidates to check the official notification and eligibility criteria of the exam to ensure they meet all the requirements before applying.