This was an odd and unique interview process for me. This was also the first time I had to take an IQ-like test for a job interview. This was my process:
I applied online and received an invitation a day later (or so) to participate in two pre-employment assessments: a personality assessment and cognitive assessment. The cognitive test was a lot of math (without a calculator), pattern matching, and detail-oriented exercises. It brought back memories of being in 6th grade and taking math tests (i.e. if this train starts here, and this train starts here, and they are going at different speeds, when will they arrive in LA? Working with fractions, percentages, etc.). I think I did fine, but I do not think it really represents my value to a company. The personality test had a few questions that I thought were odd too, such as "I do not hurt people I love" (you rate similar to a 'I strongly agree' to 'I strongly disagree' scale). My partner joked that the company is trying to limit psychopaths from entering. : )
I received a request for a phone interview a day later. The phone interview went overall well. The recruiter was casual and candid, explaining that the company is experiencing a lot of growth. Sounds like HR is very busy hiring lots of people! I was also given the opportunity to be reviewed for a couple of open positions.
I was invited to take a proctored IQ test the following week. I personally spent money to have access to practice exams through a third-party provider I found online specifically geared toward PowerSchool's cognitive test beforehand, which I regret later. They were helpful...but is it worth the risk of losing $60-70 USD for a job you may not get? The proctored IQ test was a little awkward. The recruiter had me leave my video and audio on as I took the test. Once you are done, you say you're done, and you say goodbye.
I heard back a week or so later that I was invited to a video interview with a hiring manager. The hiring manager was candid and kind, as well as detailed out what to expect in the position. It was the first time the interview process felt 'normal.' In the end, I was offered a position at another company, so I ended the interview process.