Welcome! How is life in Jamaica?
Yes, it is very possible to prepare for the exam online, from Kingston, as long as you have access to the internet and have a computer that is up to date with adobe flash, and adobe acrobat. The way things are set up, you receive one e-mail a week, for each lesson (one for writing and one for speaking if you get the bundle).
Each lesson has an assignment. For speaking you would practice with friends. For writing you would post your assignments on-line, to get personalized feedback on how to increase your score. Personalized feedback for speaking would be a one-on-one consultation over Skype once you have reviewed all of the lessons, videos and assignments.
Writing is 2 months, speaking is one month. There are also individual practice exams for listening and reading, on-line. The Study Guide has links on where to improve your reading of nursing in Canada and listening skills. Depending on your skills, you may be ready to write the exam after two months, but some people need more time than that. Perfection when it comes to listening and writing a report is expected, to pass the exam. If you have not done so, read some of the questions and answers on Dear Kim.
So, do you know where you want to live in Canada? Have you started the process? Do you know when you would be arriving? If it is within a year, it is a good time to be studying for the CELBAN. If it is more than that, you may want to consider coming to Canada as a visitor, to take the exam, and then return. (I am not sure if this is still an option, but I know it has been in the past.)