The most important skills a candidate should possess before an interview can vary based on the specific job role and industry. However, some universally important skills and qualities are:

- Knowledge of the Role and Company

- Communication Skills

- Problem-solving and Critical Thinking

- Technical Skills/Job-specific Knowledge:

- Interpersonal and Teamwork Skills

- Cultural Fit and Adaptability

- Confidence without Arrogance

- Situational Awareness

- Time Management and Organizational Skills

- Emotional Intelligence

It's essential to understand that while these skills are ranked, their relative importance might vary depending on the specific job and industry. For instance, for a technical role, technical skills might be more important than interpersonal skills, and vice versa for a sales role. Always research the company and role to ensure you're focusing on the most relevant skills for the interview.