yes, ofcourse if now you have your sc certificate or reservation than definitely go for it .

definitely in starting you will get some problems related to documents , changing etc.

but if you are getting it definitely take it. because there are so many benefits that you will get after this reservation, related to your college admissions, governamnet jobs, jobs in other department, entrance cutoff , income benefits. so many benefits you will get after sc cerfiticate which was provided by our government