To me, it looks like you're just having problems with algorithm interviews. I have a solution for you and it's much more effective than textbooks - go to websites like www.spoj.com, projecteuler.net, topcoder.com and many other similar online sites, I suggest www.spoj.com - start with the easiest ones (on most of these sites, problems are tagged by their difficulty level) and solve them - I mean code solutions to them in a language of your choice (But C, C++ and Java are popular in interviews) - these sites have online judges where you can submit your source code, have your code run against a large suite of test cases for each problem and get results back - all in a matter of seconds.
Solve 100s of these problems(start with easy ones and move into harder ones at your ease, learn new concepts and algos as you go) and try the interviews again in another 6 months. I promise, you'll improve a lot at this kind of problem solving. I've seen a number of people do this and succeed at algo interviewing game.
Solve 100s of these problems(start with easy ones and move into harder ones at your ease, learn new concepts and algos as you go) and try the interviews again in another 6 months. I promise, you'll improve a lot at this kind of problem solving. I've seen a number of people do this and succeed at algo interviewing game.