Data Entry Verification

I have an application developed in .net and access. The application has Two form, 1st Form is used to enter the DATA and second form is having DataGridView, where you can see the records inserted and rectify it. It has 43 fields the fields are case sensitive and have date and email field. There is around 32000 records to be inserted, out of which around 12000 records have been already inserted. You have to insert the remaining and check the rest, there should be 100% accuracy. I the work to be completed before 26th June. If the accuracy is less than 100% there would be no pay. Payment will be made by 15th July.