Usually, the qualifications for being considered are listed at the bottom of the job ad. Be sure you are having at least the minimum required qualifications to be taken into consideration. Or else, you’re wasting everyone’s time, including yours as well
Customize your Cover Letter
Don’t carry the same Cover Letter in for every job. Take out some time to customize it by including the qualifications and skills that the company is looking for so the employer knows you have the right stuff. This is your chance to crack an interview, so take the time to customize your Cover Letter, include a referral if you've got one, and include your best qualifications
Make sure your Cover Letter matches the job posting
The closer a match your Cover Letter is to the job qualifications, the better your chance of getting selected for an interview. Make a list of the qualifications the employer wants, and then be sure to include as many as possible in your Cover Letter
More than half of applicants name their resume documents, "resume.doc." "Resume" word may make sense on your computer, where you know that it's your resume only. However, on their computer, it's one of many, many resumes with the same name.
Proofread your Cover Letter
There are number of spelling, grammar, and punctuation mistakes that applicants make. Again, this is a clear indication telling the hiring manager that you don't check your work and you don't pay attention to details
Use Your Name
Try to choose a file name that includes your name. This way, it will be easier for them to know whose Cover Letter it is, and it will be simpler for them to track and manage it. It’s also less likely that they’ll lose it, or get your docs confused with someone else’s.
Keep in mind that the employers and other people who will interview you are quite likely to check your cover letter and Cover Letter file names, so make sure those titles are professional and appropriate.