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There are a lot of resources available. I am going to list a few of my favorites to learn data structures and algorithms.
- animageofmine April 09, 20151. Introduction to Algorithms by Cormen. It is really the best book written to boost your knowledge of data structures. You really don't have to go through every single data structure, otherwise it might take a lot of time. Just make sure you cover the important ones like hash map, heaps, graphs algorithms, MST, Link Lists, Binary Tree and sorting algorithms. It would be also good to go through some advanced data structures like Fibonnaci heap, Balanced Trees, B+ trees and be familiar with their complexities.
some of other data structures that are not really covered comprehensively in Cormen that I think are very useful: Trie and Bloom Filter. You should be able to find them on web quite easily.
2. Coursera: I personally like the course from Stanford University. It is titled Algorithms: Design and Analysis, Part 1 and Part 2. I think it will boost your confidence.
Make sure that you implement these data structures on your own computer in a language you are most familiar with. Hope this helps and good luck with your prep.