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How to Avoid Common CAO Application Mistakes

5th January 2026
Est. Reading: 2 minutes

Applying through the Central Applications Office (CAO) is a crucial step for students planning their higher education in Ireland. While the system is straightforward, small errors can have major consequences. Being aware of common mistakes and knowinghow to avoid them can save time, stress, and potential disappointment.

1. Missing Deadlines

One of the most common mistakes is submitting your application late. The CAO has strict deadlines for both the main application and supporting documents. Late applications may incur additional fees and, in some cases, may not be accepted for certain courses. Keep a calendar of all CAO deadlines and set reminders to ensure nothing is missed.

2. Ignoring Entry Requirements

Each course has specific minimum grade requirements and subject prerequisites. Failing to meet these can result in offers being withdrawn or denied. Check the requirements for each course carefully and ensure you meet them before submitting your application.

3. Incorrect Course Order

The order of courses matters in the CAO system. Courses should be ranked in order of preference, with your top choice first. Some students mistakenly place courses randomly, which can affect the outcome if multiple offers are made. Take the time to strategically rank your choices according to what you truly want.

4. Overlooking Supplementary Materials

Some programs require extra documentation, portfolios, auditions, or aptitude tests. Neglecting these requirements can disqualify your application. Review all additional requirements early and submit them on time.

5. Typos and Incorrect Personal Information

Even minor mistakes in personal details, contact information, or exam results can cause delays or errors in your application. Double-check all entries and ensure everything is accurate before submitting.

6. Not Using Available Resources

Many students fail to take advantage of guidance counselors, online resources, or career websites like WhichCollege.ie. These tools can help you research courses, compare options, and make informed decisions. Don’t skip this step — guidance can prevent costly mistakes.

7. Neglecting a Balanced Course List

Some applicants choose only “reach” courses, forgetting to include realistic and backup options. This can result in not receiving an offer at all if points fall short. Aim for a well-balanced list to maximize your chances of success.

Final Tip

Careful planning, attention to detail, and using all available support are key to avoiding common CAO mistakes. Staying organized and proactive ensures a smoother application process and increases the likelihood of receiving an offer from a course that aligns with your goals.

2026 CAO Handbook (PDF download)

www.cao.ie

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