Hello! Hope you are doing well. For a OC student to get a rank below 1000 you should have performed very well in your exam. As per previous years cut off, you should score atleast 125 and above. But to be more sure  if you score around 130 that would be really good oppurtunity for you. If you want to clearly know about the cut off you can use the following careers link. The link is "https://engineering.careers360.com/articles/ts-eamcet-cutoff" or you can go through the official website of TSEAMCET also. Hope this would help you. Good luck!