Chaos and stress :)
Jokes aside, please be ready to work hard and learn fast. Be ready to be molded and be ready to be pushed hard!
In terms of the 90 days expect something along the lines of:
- ~1 week of academy training with your new cohort
- Spend time getting to know them - it's amazing to know this group closely!
- A few weeks of feeling insecure because you haven't been assigned a client/project
- The next 2 months feeling insecure because you've been assigned a client but have no idea what's going on!
My number 1 advice is: give it time, keep pushing, it will get easier.
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In terms of specific tips on how to actually survive/do well, let's leverage what you've learned from casing :)
1) Understand the context/prompt (what role are you in, what company, who's watching, etc.)
2) Understand the objective (what, specifically, is expected from you...both day to day, and in your overall career progression)
3) Quickly process information, and focus on what's important - Take a lot of information and the unknown, find the most logical path, and focus on that.
4) Be comfortable with the unknown, and learn to brainstorm - think/speak like an expert without being one
In summary, there will always be a flood of information, expectations, competition etc. and not enough time. Find out which ones matter when. (i.e. be visibile and focus efforts on the things that people care about)