Imagination Technologies Summer Placement - Research Engineer interview questions

Initial interview to scope interest, which includes a live coding task, followed by Codility coding test (timed, unsupervised). Then a second interview round if you passed that (not sure what the threshold is), which is about 2 hours long and based entirely on technical/brain teaser type questions. By this point I was being considered for a graphics pipeline role, so they asked me to read up on computer graphics and sent a few resources as I don't study CS. I didn't get the offer in the end. They said it was because they preferred someone who knew computers better as I'm ofc not doing computer science. Could be because I just didn't perform well enough in the second interview.