So far a I had an online skills test because I was not a CS major. The test was very difficult but it wasn't a walk in the park either. The main problem is time. You're only given a minute per question and if you try to take it easy that minute flies by. It's mostly IQ questions which aren't particularly difficult. Some spacial transformation questions were a little tricky (rotate figure by 90/180 degrees clockwise/counterclockwise). After that I had a phone interview which asked a little bit about C and then dived into some brain teaser / logic questions. The first one I did not get but the second one with some help I did. I have another phone interview coming up.