Do colleges still care about your GPA at the end of your senior year?

Should I stop caring about my GPA? At my school a B+(3.33) is weighted a lot more than a B-(2.67).
I am at risk of getting rescinded at a college(4 Cs so far). Can I put less emphasis on the classes that I have a B+ in and let it drop to a B- but have it affect my GPA?
When colleges decide to rescind your acceptance, do they just only look at your grades second semester senior year to decide or do they look at your GPA too?

I don’t understand your plan. You realize that come September, you’re not going to magically swoop in and begin getting B+s again, right? How you finish will greatly correlate w/how you start college. Fair warning.

If you’re in danger of getting rescinded then the solution is NOT to slack of on classes you’re doing okay in. If you need to cut back on something then cut back on extra curricular. Colleges can look at first and second semester or just second semester when deciding to rescind. If you are stuck with one C but have all B+s that looks better than a C with B-s.

Agree with the poster above. Do your best so that once college starts you do well.