Senior year courses and grades will be shown on the final transcript to the college you matriculate to. College admission offers are generally conditional on completing the previously-reported in-progress courses with high enough grades. Some schools, like most UCs, tell you specifically what the threshold (as in a minimum GPA and no D or F grades). Other schools are more vague about wanting you to maintain your level of academic performance without giving a specific threshold.
CSULB’s conditions of admission are not too stringent:
http://web.csulb.edu/depts/enrollment/admissions/freshman_toa.html
SDSU’s conditions of admission state that “You must also maintain your reported overall grade point average.”
http://arweb.sdsu.edu/es/admissions/transfers/admitted/step1.html