Here is a story of my friends who got into AIIMS Delhi. He was unable to crack the M.B.B.S. of AIIMS Delhi so he decided to do it later whenever he got the opportunity. Later, he completed his MBBS from IMS BHU with an AIR 1. His UG days made him more confident and he knew he was capable enough to try again. During PG entrance, he attempted all 200 questions and surprisingly got AIR2 in AIIMS PG entrance during my internship. He also got AIR 1 in the AIIMS DM cardiology entrance exam.
When asked about the strategy he adopted to achieve such ranks, he said that all he did was dream big and work hard leaving the rest to luck. What he realized was important, was to believe in yourself even if everyone gives up on you.