hello abhinav!!To improve you score in jee mains i will tell you few strategies .Firstly,check the previous years question papers so that you can know the weightage of the topics.make sure of the syllabus completely.continue practicing and the assignment examination held on jee model in online.note the solution of one problem and try different problems on it.As negative marks makes count in mains exam..soo be aware of it.dont even neglect the single subject cover three subjects equally.make notes of everything you practiced.Revision i for chemistry  very importent because there is lot to remember.some of the book i can suggest you for mathmatics (new pattern Mathmatics Arihant)do and for physics "HC verma.RESNICK HALLIDAY "this is for theory and for practice complete new pattern IIT physics Arihant.Hope this information might have helped you a little bit .All the best for your bright future

Hello Abhinav, Well, There is no shortcut of scoring good marks in JEE Mains. You need to practice each day till the final day of exam. First of all, make a routine and follow it without missing anything. If you are in a coaching institute, make sure to solve the question modules teachers give you and don't try to solve many books. Also don't practice new concepts in when exam is approaching because that might lead to decrease in confidence.