You have three chances to pass an exam, when you sit it for the third time you are required to pass otherwise you cannot continue on your chosen course and will be deregistered. You could possibly begin another degree course at DIT, or start to study at another university. The examination committee will decide if you can begin another degree course in a higher semester or if you must start from the beginning. All this depends of course on your legal obligations if you are not an EU citizen. Please be aware that for every application an individual application must be made.
We recommond that you contact the International Office and your assistant in the faculty to talk about your options.