I am a student from tier 3 college in INDIA, I have Amazon and Microsoft interviews in coming months. I wasted my first few years of college until december 2019.
So I came across this website LeetCode in the month of Nov 2K19, in that time i was havin my semester exams, so i had prepared a plan to start Leetcode after Exams.
I have started LeetCode in Jan 2020, till that date, I was so poor in DS and Algo that I was not able to solve even Two Sum!
Always doubt myself about that I am not worthy of Big4 Companies!
But after seeing so many post in disscuss and one post from (nlogn) it makes me to become persistence about solving problems daily, I got motivated and wanted to go for Big4 and worked day and night to be prepared!
Until Now I have solved over 430+ problems on LeetCode. Also I revisted many problems twice or thrice or even more because I feel like I am dumb!

I failed in some interviews like in startups because of less knowledge about CS subjects last year!
so for this built my fundamentals on CS subjects and then also worked on some mini projects(not so good ones).

Few days back I thought of giving codechef long challenge but failed miserably and only able to solve 5 questions!

I am seeing so many post about achieving 5 star, 4 star at codechef and codeforces, and i think am i not too dumb for GAfAM?
I am not a 5 star Competitive Coder, but I really give my 100% these 6 months!
But dont know if I am still worthy or not for Amazon or Microsoft!

Please let me know about things about Competitive Coding Vs Interviews because I got so demotivated and I dont know if i have enough knowledge or mind to go to Big4.