There are multiple websites where they publishing data in which column goes more than 100 and 10000 raws.
You can visit Google website

https://datasetsearch.research.google.com/

One following link 🖇️ given to you

https://www.compare-school-performance.service.gov.uk/

Suggestion

Do not search like

data set which contains 100 column and 10000 raws

100 column dataset
Dataset for machine learning 

Randomly search like school data University data medical data