hii ,

since you have taken drop you do not need to worry you have to just practice questions and try to solve more and more question , there is no need to worry , as you will not get marks for sitting and worring about future , remember you do not need to solve every question in jee .

for college through jee mains use the jee mains college predictor - https://engineering.careers360.com/jee-main-college-predictor?ici=cp-listing_engineering&icn=JEE-Main-College-Predictor