The best consultancy company for ISO 21001. However, you can evaluate consultancy firms based on several criteria such as reputation, expertise, experience, customer reviews, and their ability to meet your specific needs. Here are a few consultancy companies known for their expertise in ISO 21001:

Bureau Veritas: Bureau Veritas is a global leader in testing, inspection, and certification services. They offer consultancy services for various ISO standards, including ISO 21001, focusing on educational organizations' management systems.

DNV GL: DNV GL provides certification, verification, assessment, and training services across a range of industries. They offer consultancy services to educational institutions seeking ISO 21001 certification.

MSCi(Management System Compliance Incorporation): The top ISO Consultants is a globally recognized certification body offering a wide range of services, including ISO 21001 certification consultancy. MSCi has extensive experience in auditing and certification across various industries.

SGS: SGS is another prominent company offering ISO certification and consultancy services worldwide. They provide support to educational institutions in implementing ISO 21001 standards.

TÜV SÜD: TÜV SÜD offers a wide range of certification and auditing services, including ISO 21001. They provide consultancy services to educational organizations seeking to enhance their management systems.

Intertek: Intertek offers quality assurance and certification services across various industries. They provide consultancy services to educational institutions looking to adopt ISO 21001 standards for educational management systems.

Consider factors such as their track record in implementing while choosing an ISO 21001 consulting firm, industry expertise, client testimonials, geographical coverage, and cost-effectiveness. It's also beneficial to schedule consultations with potential consultancy firms to discuss your specific requirements and assess how well they can meet your needs.