Flow Traders US LLC 第二轮mental math正确率多少可以过

求问，前段时间做完 Flow Traders US LLC. 的那个性格测试，然后今天收到了说有一个 面试，说是在skype 监督下先做一个 math assesment

The math assessment will be proctored by a member of the recruitment team via a live video connection. During the test, you will be given 10 minutes to answer 75 questions that you must calculate in your head (no pencil/paper or calculation tools). Please note that the questions will be divided into three sections:

30 easy calculations with addition, subtraction, multiplication, and division; for example: 5 x 14; 28-49; 6 x 8; 52+89
30 more difficult calculations (with decimals); for example: 0,75 x 0,3; 0.997+1.03; 55.338-0.889
15 more difficult multiplication questions. This section is multiple choice and will include questions like 72.4 x 1.03; 1250 x 630; 400 x 55.5


然后面试团队会问一些问题。。。

请问大佬们这些题，达到多少的正确率才可以进入下一轮？

我问个问题。。。这些HF的题目一般是选择题还是填空题