I submitted my email into their college recruitment page online and was contacted about an online info session that Gartner was having for my university. I attended and afterward reached out to the recruiter and that was how I was put on their radar at first.
The process was pretty long and difficult (I had been passed through a few phone screens for other roles as well but ultimately was put through for this role), but everyone that I talked to gave great insight on how to prepare for the next stages. For the CES role, I had an initial phone screen with my recruiter (~20 min), then a phone interview with the recruiter (~45 min), a phone interview with 2 hiring managers (~45 min), and finally a panel interview onsite with a manager and director (~1.5 hours).
All the questions I was asked throughout the entire process were behavioral so make sure to pull from your experiences, use the STAR method, and match them to the traits they want to see in the role (good communicator, organized, feedback-driven, etc.). Most of the interviews were pretty standard, they asked you questions, gave you a chance to ask them questions at the end, and then provided some quick feedback.
The panel interview was the most difficult. I had to prepare a powerpoint presentation about myself and why they should hire me, answer behavioral questions, and also do a web walkthrough of a website of my choice. It seemed like a lot overall for an entry-level role, but I feel so prepared for any interview process I will go through in the future, and also for the role. Everyone is super nice and want to see you succeed in your interviews. Your recruiter will also be with you every step of the way and will answer any questions and give you tips to prepare for your next step. Don't be afraid to really sell yourself to them and highlight your strengths!