Ask HN: Practice code beyond CITC, LeetCode etc.

I have recently been rejected from a company that i was looking forward to. I did good in first interview. Which was typical DS type interview i.e., do something with a Tree. I was able to solve the problem and code it in time.

In second interview, I was presented with a question which wasn't anything related to typical CITC, LeetCode or HackerRank problem. It was a business usecase that i needed to implement. Wasn't hard at all but just because i didn't have much programming practice, it took me more time than anticipated and hence I got rejected.

I was wondering, if there any websites, which has list of some programming/business use-cases that i can practice on. Something that are doable in 45 minutes of time span.

Anything would help