long interview process multiple interviews both online and in person case studies one phone call technical interview both technical and personal interview questions asked with human resources and technical personel like engineers and managers

First, I got phone from recruiter for joining the interview. The interview continues nearly 5 hours. At the start of interview they make an IQ test which has 50 questions during one hour. Then they want a group discussion about how we can enlarge an automobile company. We discussed it among 5 people during 1 hour according to given informations about compony to us. Then they ask questions about group presentations. Finally, we made private presentations about similar topic. This time it was motorcycle company. 5 days later, they informed me about the result with an e-mail.