While a top position is never guaranteed, you can increase the likelihood of appearing in a top position in two ways: set a high bid and also write a compelling title and description that is highly relevant for all of the keywords you’ve chosen and ties closely to your ad’s landing page. 1
1 Your bid shall be the only factor that determines your Sponsored Search ad's position until the new ad ranking model is launched. Following the launch of the new ad ranking model, Sponsored Search ads in search results will be ranked based on a combination of your bid and your ad's quality index.