Hello Rachana,

Please go through the following troubleshootiong steps

1. Browser Issue: Please Check the browser you are using is compatible. Try switching to other browser mostly chrome or firefox.
2. Internet Issue: Please check you have a proper internet connection. And the bandwidth isn't low. If on cellular hotspot please try to change the network.
3. Website Issue: Sometimes due to lots of internet traffic the website server goes down and lags a lot. In such case please try filling the form in odd hours ex. in the morning before 8 or at night after 9.
4. In case none of the about scenario helps you please contact the KEA UG-NEET authorities

Hope that helps you