Three main ways to prepare for a technical interview are:

  1. Books
  2. Websites
  3. Classroom courses

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Books

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  There are a dozen or so books in the market. 
  The two most popular books (and well written also) are:

  1. Cracking the Code Interview
  2. Elements of Programming Interviews

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Websites

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Websites are roughly divided into two groups:

a. Where you can write code and compare yours with others' solutions

Popular ones, in no particular order, are:

http://leetcode.com

http://HackerRank.com

http://uva.onlinejudge.org/(UVA Online Judge)

http://SPOJ.pl

https://projecteuler.net/ (Project Euler)

Note that not all of them have questions that are interview oriented. But it's great practice regardless.

b. Ones that give you a problem and then a solution, with no or little competitiveness

Popular ones, are:

http://InterviewCake.com

http://GeeksForGeeks.org

http://Glassdoor.com

http://Careercup.com

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Classroom courses / Bootcamps

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http://InterviewKickstart.com (I run this one)

Having said that, realize that you are not alone. Most programmers these days don't use fancy data-structures and algorithms at work.

But unfortunately, interviews still ask for it. That is a whole debate on its own.