I checked it a lot of times but it's still show that it's gone be 7100-7800 is this correct I mean will be my rank under 8k?and will I get a sit in govt collage with this rank?

Ananya, the rank predictor is not working properly I regret for the inconvenience caused therefore. That's the reason it's showing erroneous ranks. Please don't go with the flow. Follow the rank I've provided you. And with this rank, you have cent percent chances of getting a government college. But if you've a average rank in JEE main, you can get government colleges using it since you can appear in WBJEEB counselling using both JEE main and WBJEE ranks.