Assessment center for fresh graduate

I applied for a graduate program in a big company and I passed the first interview last week, next step is assessment center, it'll be totally online, so basically what I have to do is reading some pa

I applied for a graduate program in a big company and I passed the first interview last week, next step is assessment center, it'll be totally online, so basically what I have to do is reading some papers and do due preparation within 90min, then I do a presentation and a role-play with the hiring managers. This would be my first time to do this type of assessment center, I really don't know how to prepare for it, as I have no idea what the topic would be. Any ideas? This is a good job and I do want to get it. （ps: this is a technical position)