I had been scoring around 75-80 percentile for sometime but since the last month my scores have been continuously dipping and now i have reached to 50 percentile,how can i turn things around?

Hi In later stages percentiles decreases because less students appear for mocks in window period, try to focus only on learning from mocks and don't take anything on your heart , just continue the process , keep analyzing your mistakes and work upon your weak areas.