How to get GPT Builder to read spreadsheets correctly?

I’m having a hard time getting consistently correct answers from GPT on questions relating to a spreadsheet that I uploaded to it. The spreadsheet is in pdf form and has model numbers, part names related to those models, and part numbers for the part names. I’ve tried explaining to it how to get the right answer and it could just be that my prompts aren’t good enough. The thing is that it gets it correct most of the time on the third try. When it gets it wrong though it’s totally off.

I’m just looking for any advice if someone else has faced this issue before. Thank you!