Here's a breakdown of key insights gleaned from the job listing you've shared, crafted in the form of five tips for making your application successful:

1. Highlight Relevant Experience: In my extensive experience, it's critical to make your resume relevant to the specific post you're applying for. Highlight your proficiency in History or FRS to catch the eye of employers. Jobs in Zimbabwe, especially those at mission schools, value educators with targeted knowledge.

2. Timely Application: Always pay attention to the job vacancy's closing date. This listing requires applications by 22nd December 2023. What I've noticed over time is that prompt applications often suggest to employers that you're organised and dedicated.

3. Application Style: The method of application is indicative of a company's desired communication style. For this job listing, they've provided an option to email or app. Choose the medium that you're most comfortable and professional with, as this could be the starting point of your interaction process.

4. Education Requirements: It's mentioned that a diploma or degree in History/FRS is required. While not explicitly asked for, consider sharing your academic transcripts as part of your application. This will further authenticate your fulfilment of the job's requirements.

5. Mission School Experience: Given that this is a position at a mission school, make sure to highlight any relevant experience you might have in such schools or environments. This could make your application more appealing to the recruitment agencies in Zimbabwe.

Three things that could make a candidate stand out in a large candidate pool based on the job details:

1. Volunteer Experience: Increasingly, what sets candidates apart for NGO jobs in Zimbabwe and related vacancies in Zim is significant volunteer experience. Illustrate any work done outside of a professional capacity, particularly in relation to teaching or community service.

2. Certifications or Courses: Any additional certifications or courses in education, teaching methods or classroom management could strengthen your profile. In my experience, this shows an appetite for continuous learning and enriches your professional repertoire.

3. Letters of Recommendation: If applicable, applicants could provide recommendation letters from previous employers or institutes validating their skills, work ethic, and how they've added value.

Based on the job listing, three aspects to focus on that novice applicants might overlook:

1. Job Description: Many applicants miss out on truly understanding the job description. In this case, note that the teacher's "primary responsibility is to teach." Articulate your passion for teaching and how it aligns with their mission in your application.

2. Contact Details: Always take note of contact details for vacancies in Zimbabwe. In your case, both an email and a phone number are listed. This could indicate there might be a follow-up interview call after initial screening.

3. Location-Specific Keywords: Include terms like "Zimbabwean jobs" or "jobs in ZW" in your cover letter or CV. Many recruitment agencies in Zimbabwe are moving towards automated systems, where keywords help surface your application from the stack.

In summary, if you tailor your application, pay attention to details, and emphasize your unique experiences and educational qualifications, you'll give yourself the best chance for landing job offers in Zimbabwe.