When should I schedule? Starting 6 week fellowship soon.

If I were you I would schedule my nclex in 4 weeks. I just wrote it and found out I passed. I highly suggest Uworld, its an In expensive question bank that gives all the content you need in the rationales. I did all of their questions only supplementing with textbooks when I didn't understand something and I passed in 75 questions! If you study everyday and you understand the core content you will pass!!

Remember, my opinion is worth what you paid for it....

last summer, I had an externship. I was so busy and so tired at the end of my 12 hr shifts and even the next day, there's no way I could have studied effectively. So, I'm going to say schedule the NCLEX for right before the fellowship starts and then hit the books HARD, like full time, over the next two weeks.

If it were me I would take the NCLEX after the fellowship when I can be fully rested & devote enough time to studying as I can. That way I can pass the NCLEX the first time & get a job. I wouldn't want to fail the NCLEX & lose the fellowship either. So that's what I think.