I got a D+ my first semester of my senior year in my AP gov/econ class. I got accepted to Cal State Long Beach but i’m worried that my admission will be rescinded. I am retaking a semester of government to make up for it. Will my admission get rescinded?
Is it possible to get it up to at least a C-? Usually, it’s no D’s, F’s, and/or felonies.
I would speak with your counselor, and probably (after speaking with your counselor), let the college know - surprises are not taken well.
I am already in my second semester so I can’t change that first semester grade 
My counselor just advised me to retake that class to make up for the first semester. I am also not sure how to contact the schools because I can’t seem to find the email for freshman admissions/grade reports.
It’ll show up in your midyear report and final report. CSUs and UCs are notorious for rescinding admission for anything less than a C. You’ll most likely get rescinded.
Showing CSULB that you are retaking the class will definitely help. You should contact CSULB admissions sooner than later.
Telephone Numbers
Admissions, Registration and Records
(562) 985-5471
(Includes: Admission, Credit Evaluation, Registration, Residency, Records and Graduation.