Reward your pupils and students when they achieve a goal or target in any area; this will not only motivate the recipient, others will want to emulate the effort in order to be so rewarded themselves.
Certificate of achievement motivates every student to keep on task.
Here is a link to free various occasions reward certificate maker: http://www.123certificates.com/
Here is another: http://www.certificatestreet.com/templates/education.html
Here is yet another: http://www.educationworld.com/tools_templates/certificate_achievement_award.doc