If you are talking about the career360 app thenyou may get the file in the path:

file manager> internal memory> downloads> your file

Now also sometimes the brochure can be directed to your registered email. So you can visit your email and search for it there also you can find.

For other websites you can find it in the downloads section of google chrome or the downloads file which is usually in the file C of PC. For smartphones you may go for the download section of the chrome(for other websites only)

I hope my answer helps. All the very best for your future endeavors!