Yes, you can claim 20% tax relief on the two year higher certificate under the following rules:
Courses for tax relief must be two years in duration (if you only intend on completing one year, Revenue do not allow tax relief).
As this is a part time course under Revenue rules, the first €1,500 is a disregarded amount e.g.:
€2,500 (fee per year) minus €1,500 (Revenue disregarded amount) = €1,000
20% of €1,000 = €200 per year of tax relief
For more information please see the Revenue website.