How to self learn and solve problems?

If you visit my profile you will see that I'm not that good at problem solving. I solve only A type problems I have 1 year left to complete my college. I didn't do well in ICPC regional contest. I want a good CodeForce profile within this one year and a good problem solver as well. Is it even possible to do so??!!!

Things I know till now

1. Basic Data structures and Algorithm;
2. C++ STL;
3. Binary Tree;
4. Graph's Traversal, Dijkstra, Bellman, coloring and Bipartite, TopoSort, Cycle Detect, Minimum Spanning Tree
5. Some Number theory topics.
6. Backtracking and Recursion, Greedy;