The best trick for guarantee clinical research interview is to boost your reference that is possible by having a strong network. These referrals increase your chances to get interviewed by the recruiters and can be helpful to get into clinical industry.
Having a good network especially with someone who is already an employee at a CRO can be used as leverage. That person can refer you for an available position in company and can personally email your resume to the recruiter and hiring managers. Having a strong resume is also necessary that includes keywords and research related experiences. This increases the chances that recruiter will take a close look to your resume and make a strong impact on the recruiters. This boosts your chances to get to the interview. References also work in interview but you should also play a strong part of your own in the interview to get hired.