How to do salesforce certification in SriLanka. can we do the examination online?
I hope you have webassessor login to write exams. If not please create one from this link
You can take the exam in two ways
Please check here for onsite location
Answering for your question, Yes, you can take online exam also. There are some set of rules need to be followed for online exam, you need a web camera for this. So please read the exam policy before you register for the exam.
I prefer Onsite exam. This depends on you whichever you feel comfortable you can take it.
Below links will be useful for your exam
All the best for your examination.