A secure and adaptive examination revaluation framework using blockchain and subject-aware AI evaluation

The growth of digital technologies has led to an increasing need for safe, open and effective processes for managing examination records and revaluation processes. Conventional examination evaluation systems are mostly manual, which leads to delays, human error, lack of transparency, as well as an administrative overhead. Students have to wait for extended durations to gain access to the results of revaluation or verified answer scripts which discourages confidence in the revaluation process. To overcome these issues, this paper proposes "A Secure and Adaptive Examination Revaluation Framework Using Blockchain and Subject-Aware AI Evaluation." The proposed framework uses a private blockchain to securely store the finalised examination records and ensure data integrity, authenticity and prevent unauthorized modifications. Following result declaration, students will be able to submit their answer scripts digitally and submit an application for revaluation through a secure web-based platform, allowing for more efficient and faster processing. The framework supports typed and hand-written answer scripts due to the use of Optical Character Recognition (OCR) techniques to extract text. A subject-aware, rule-based AI evaluation module is used to analyse the extracted content using predefined academic rubrics and domain-specific keywords for generating the question-wise suggested marks in an explainable and consistent manner. To ensure that fairness and accountability is ensured, an evaluation produced by AI generators is reviewed by authorized academic personnel via multi-level approval workflow before being finalized. By combining blockchain technology with subject-aware AI-assisted evaluation, the proposed framework ensures less human workload, faster processing of revaluation and improves the transparency and trust of examination systems. The unalterable nature of record storage using blockchain technology enhances the trust of students, faculty members and examination authorities, paving the way for the adaptation of the framework in modern-day educational institutions.