hello I think I'll give 80 score having reserved category(SC) Will I get into any of the 18 nls?

Hey.
The cut off for admission in National Law Universities through CLAT is a lot lesser than what is required ny the general category. The cut off for admission to any NLUs for the SC category would go around the rank of 11,000-12,000 as per last year trends. But for the SC category, a score of 80 would be decent for a fair chance in the the lower/ middle For Top NLUs you don't seem to have much chance. You can expect your rank to be around 7000-9000. Hence you seem to have a fair chance.
Best of luck