Following subjects are present in third sem for MCA program, including theory as well as practicals-

1. DATA BASE MANAGEMENT SYSTEMS
2. COMPUTER NETWORKS
3. UNIX PROGRAMMING
4. MANAGEMENT INFORMATION SYSTEM
5. DESIGN AND ANALYSIS OF ALGORITHMS
6. DATA BASE MANAGEMENT SYSTEMS LAB
7. UNIX PROGRAMMING LAB
8. COMPUTER NETWORKS LAB

You can also go to the official website of JNTU, Kakinada mentioned below, you will find the syllabus of MCA Program, download it and you'll get detailed information regarding subjects in all the semesters-

https://www.jntuk.edu.in/dap-mca-r16-course-structure-and-syllabus/