I have just done the online assesment. As mentioned above there are 10 questions : 2 basic finance concepts, 1 stats, 1 matlab and 6 math related. The questions are easy and each should not take more than 5 minutes to complete/explain ( I would say anybody who took 1st and 2nd year math courses would get the right answers) .
I found the timing a bit confusing. It does not appear anywhere at the begining , so make a note on the exact time you download the assessment. However once you upload the documents, there is a note how long it took you. This also means that you can upload the documents even after 1 hour and 15 minutes and the system would still accept it. Also you can upload more than 1 ( I did 10 documents, one for each question) at different times ( finish the 1st question, upload it, finish the 2nd, upload it, etc).
To members having an interview tomorrow, good luck and keep us updated how it went!