Hi this is me Aryan kumar i am a engineering student pursuing my graduation in bachelor of technology mechanical engineering department ,i have qualified JEE mains exams with AIR 6009 . later i want to share my experience to all those who are preparing for any engineering or medical entrance exams . because i found that mathematics, physics , chemistry are not only about the formulas , it is all about to understand the concepts properly , because concepts are the key feature of problem solving , and many students get stucked in the problem solving parts so i just want to share my experience to them .