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help me pls....

hii, I am raman_111. I am continuously practicing problems and participating in contests. I have solved around 400 problems on codeforces and I like to solve problems more and more. there are so many my college mates who solves few problems only but they are bettrer at competitive programming than me. pls. suggests to me what should be the strategy while practicing for better improvement. Which things I need to keep in mind while practicing on codeforces.