Imagination Technologies Graduate Hardware Design Engineer interview questions

I applied online, then I've been contacted by the HR team asking about my availability to make a phone interview (I gave a range of days). Without any notification/confirmation about when the interview would take place, I received a call to make an interview, and I did it anyway without preparation. The HR sent me an e-mail later asking about where I am from, and when replied (I am not an EU citizen), I heard nothing from them again!

i went through two hours of technical questions and one hour with human resources. I had phone ane skype interviews beforehand. Visit of the building and presentation of their activity is included. Technical questions are quite intense as they try to reach your limits.