well, if you want to excel in quantitative trading or research also you will have to have a strong foundation in mathematics and Statistics like probability theory stochastic processes time series analysis and statistical modelling. you need to also have Good programming knowledge in Python java C++ and also are need to have good financial knowledge.Like about financial market financial modelling or risk management. You need to also additional skills life data analysis and visualisation. You can have knowledge about machine learning and high performance computing. also communication skills are very important. Hft interviews in the technical interviews, you need to prepare for the data structure and algo questions about some statistical  and mathematical concept and machine learning. They are very important and for the HR or the behaviour interviews, you need to highlight your teamwork skills your passion for finance and also problem solving skills.by focusing and preparing thoroughly you can increase your chances of passing the interview.