You can check your results on Sri Lanka Examination Department official website by Clicking Here.
If the website slows due to web Traffic, go to below websites or check via SMS.
Check exam results via SMS:
EXAMS <Number> and send to 7777 from your Dialog Mobile
EXAMS <Number> and send to 8884 from your Mobitel Mobile
3. Air Tel
EXAMS <Number> and Send to 7545 from your Airtel Mobile
EXAMS <Number> and Send to 8888 from your Hutch Mobile
EXAMS <Number> and Send to 3926 from your Etisalat Mobile