Here are a few tips to increase your chance of getting hired:
I can see why that gap in my work history might concern you. But since then, I have maintained a solid work record. I come to work on time and don't call in sick. I am a very hard worker and quick learner.
I understand that you have questions about my background. I assure you that I have learned from my mistakes and have corrected past problems. I have spent time training for this career path because I am more mature now and have a solid plan for my future. If given the chance, I will give your company 100 percent effort. I will be at work early, and even stay late if necessary. I know you will not be disappointed if you hire me.
It's also a good idea to pay attention to body language. Sometimes your body language can give off the wrong signals. People may think negatively about you because if it. When you practice how to answer interview questions, pay attention to your posture and eye contact. Some tips:
American Job Center Finder
CareerOneStop's Resume Guide
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Common interview questions
Work Opportunity Tax Credit