Update Exam Grade Records

I have a set of exam scores that are already in our system but now require correcting. All I need is for the existing entries to be located and their values replaced with the new, verified marks I will supply... (Budget: ₹1500 - ₹12500 INR, Jobs: Data Analysis, Data Cleansing, Data Entry, Data Governance, Data Integration, Data Management, Data Processing, Database Administration, Website Accessibility)