Hello candidate. As you mentioned that your rank is 12,740 in AP Eamcet under SC category, it is difficult for you to get ECE in JNTU Kakinada. Your rank is high when compared to previous year cutoff ranks. There is nearly 3k difference between your rank and previous year cutoff rank.

Yes, you can get ECE in JNTU Vijaynagaram. 

Hope this helps!!!

Good luck.