IBM Software Developer - Entry Level interview questions

I have applied online through IBM Careers , after two week I got a coding test that had some video questions and some algorithm questions,for video questions they give you some time to record answers ,for coding questions you get half an hour or so,you should be good in basics of algorithms and data structures to solve those problems.After q week I got rejection.

I applied online and received an email to complete a coding challenge online about a week or two later. The email stated that I would have 5 business days to complete the challenge, and the questions in the coding challenge would be general in nature and that studying would not be necessary. I figured since this was an entry level position, I should just review data structures and algorithms; however, there was one question that required a verbal answer that I would have needed more background on the topic in order to be able to answer it better. The email and original job post did not indicate this.