Hi, 

308 is bit less as for a general category student. We can still not say anything with much authority right now as results are yet to be declared. But still seeing previous years cut offs for govt bds, 308 is less. I will suggest you to continue your studies and get a higher score next time (if you are planning to take a drop again.) Who knows you may even get a mbbs seat. 

For nursing, different colleges conduct their exams by themselves. So you can take that exam and on clearing the entrance you can take admission into that course. 

Good luck !