applying for a new job, what a process

Well you are correct. Applying for a job isn't that easy. You need to be patient enough to wait for the results of all the tests you took. You also need to be confident so that you won't feel nervous during the interview. If you will be nervous, then there's a tendency that you might not be able to answer the interview questions correctly. I don't exactly know what kind of job you are applying for since you said you were asked to write an eighteen-page document but I just hope that you will make it up to the end of the process. If you made it in the first round, I believe there's no reason for you not to make it on the next few rounds. Just be optimistic all the time.