Graduated college nearly a year ago. Starting first relevant job to degree soon. How should I prepare?

I will be starting a job soon relating to the sciences. I forgot the advance stuff and know just the basics. How to best prepare before first day? Will employer/co-worker look down on me for making “simple” mistakes first week?

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official