Hello Harsha,
It would be quite difficult to get CSE in the JNTU campuses (JNTU Kakinada, JNTU Anantapur, or JNTU Vizianagaram) with an AP EAPCET rank of 18,000 in the OC-EWS category (male) because the cutoff for CSE in JNTU's typically goes in the top 5,000–10,000 ranks.
Although it is not saying much, you might have a slim chance for lower demand branches like IT or ECE in JNTU Vizianagaram or JNTU Kalikiri depending on this year's seat matrix and the competition. AP ECET Rank vs college
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