The Cambridge Digital Mocks Service offers on-screen assessments created by transferring paper-based (PB) exams into a digital test platform. This feasibility project considered the validity of extending the Digital Mocks Service to maths and science qualifications, thinking about (1) the outcomes that are likely when maths and science items are 'lifted and shifted' into digital formats; (2) the intended purposes of the Digital Mocks Service assessments; and (3) how far maths and science assessments in the Digital Mocks Service could meet these intended purposes. The project drew on published research, the knowledge and experience of colleagues, and findings from in-house trials.