Hello aspirant

TSEAMCET is the entrance exam conducted by TS state board to get admission in engineering colleges

As you rank is 18 k you will get a seat in JNTU, karimnagar if you don't belongs to bc-b and oc, since the closing rank for these categories is below 10k otherwise you will get a seat 

Here is the link for detailed information about cut off ranks of JNTU karimnagar 

https://www.careers360.com/colleges/jntuh-college-of-engineering-karimnagar/cut-off

Hope this helps

Good luck