2x interviews (+ 30 mins reading time for each), 1x test
Reading; gap year; specific interests
Reading; practicing speaking
Don't think about it afterwards too much
Remember this advice isn't official. There is no guarantee it will reflect your experience because university applications can change between years. Check the official Cambridge and Oxford websites for more accurate information on this year's application format and the required tests.
Also, someone else's experience may not reflect your own. Most interviews are more like conversations than tests and like, any conversation, they are quite interactive.
Interview, assessment, interview (1 interviewer in each interview, half an hour reading before each interview)
Mostly about my reading, how I planned to spend my gap year, my specific interests.
Make sure not to think about it after it's done and there is nothing else you can do, you always focus on the bad points but actually there are plenty of positives to focus on too.