Hi Priya,
There are modules to read and write data from excel on mendix marketplace.
You can use this offiicial document, this will explain to you how to use those modules.
https://docs.mendix.com/refguide/use-excel-documents/
I hope you already have S3 connector to get your data otherwise you can use AWS S3 Connector module from maketplace.
For that you can refer to this document https://docs.mendix.com/appstore/modules/aws/amazon-s3/
Hope it helps 🙂