i am currently in class 11th . for physics , i am refering to HC verma , resnick and halliday and university physics by young and freedman . the problem i am facing is that i am not able to find more better(and harder) problems to practice . when i started my preparation , i was told that almost everyone is able to do the easy problems in the jee paper but the hard onces really decicde the ranks . so please suggest me from where can i practice harder problems .