Sky Software interview questions

Before several months, I applied for the Software Engineer position and received a call about a month later, which only lasted around 4 minutes. After that, I was invited to their office for a technical interview and an HR interview. The technical exam was a mix of math and coding, and I feel I performed well in both. However, After my interview, I know other candidates who were rejected, but I didn’t receive any feedback — no rejection, no acceptance, nothing. It feels like HR is just filling their time with interviews without any real intent to hire.

In the first place I have an exam on paper. There is a lot of questions not related to software industry; statistics, Calculus, Integration and differentiation ,Population Census. After I finished the exam there was a interview with the HR with ordinary questions.