In most cases you must sign a contract and stick to the terms. You can research a school in advance by speaking to former teachers. Just remember your experience is individual and just because some else loves or loathes a school doesn't mean you will share their views. Patience and commitment. Our data base is reliable because the positions are actually posted and updated by the schools themselves.
Many organizations post listings for one year at a time and hire throughout the year.
Other employers post a job for a week and are overwhelmed with the e-mail responses. If you are searching for the perfect job than I suggest checking out the Most Recent Job Postings regularly for the new positions. People like . . . On our second day we had gotten ourselves a job and had to turn down many others. The TEFL qualification helped a great deal.