I don't think the interview was challenging. The written test included two brain teasers, several math problems, market knowledge and self defining problems, like do you think you are an organized person. You have 15 mins to finish the test and it is quite simple if you have gone through the reviews others put here. There are also some behavioral questions like what two characteristics do you think to be a good trader. People there are friendly, you feel like you are chatting with the recruiter. But the problem is salary, there is no base and they require capital contribution. For entry level position, they also require you to attend a training course,which you have to pay for.