CodeChef - Level 0 to Level 5
Level 0 - https://www.codechef.com/practice/basic-programming-concepts
Level 1 - https://www.codechef.com/practice/logical-problems?roadmapSlug=become-5-star
Level 2 - https://www.codechef.com/practice/1to2stars?roadmapSlug=become-5-star - https://www.codechef.com/practice/2-star-difficulty-problems?roadmapSlug=become-5-star
Level 3 - https://www.codechef.com/practice/2to3stars?roadmapSlug=become-5-star - https://www.codechef.com/practice/3-star-difficulty-problems?roadmapSlug=become-5-star
Level 4 - https://www.codechef.com/practice/3to4stars?roadmapSlug=become-5-star
Level 5 - https://www.codechef.com/practice/5-star-and-above-problems?roadmapSlug=become-5-star