Whether it's lying, exaggeration or just describing yourself from a different point of view, you should really realize if your resume / motivation letter is appropriate or not. Blatantly lying can yield yourself an interview, but unless the interviewers are not totally stupid (which they rarely are. not at least all of them), you will get busted right there. Telling about your skills and achievements in a not too modest way however is a different story, and there is no one golden rule that works or doesn't. If that won't get you any interviews, then you either lack skill, experience, education etc.. or all of them. Depending on your field it can be nigh impossible for junior candidates to get a job. (Also depending on your field, practicing your skills on your free time can be possible and useful)