Toptal Android Engineer interview questions

I applied on their site as Android Engineer, and after a week they told me that I was invited for a initial interview. This interview last 15 minutes, during which they tried to check my english. After that I received an invitation for an online coding test on Codility, I had to complete the test in the next 48 hours. The test was a bit difficult, there were 3 coding exercises and only 90 minutes. My score was very low but they gave me a chance to explain my thoughts by email. After that an engineer evaluated my answers and they decided that they will not move forward with my application. Eventually they told me that I can retry after a month.