ඔය දෙක නැතුව ලංකාවෙ වෙන IT ඩිග්රියක් කරල ලක්ශයක විතර පඩියක් අරන් පෙන්නපන්කො
උඩ තට්ටුවට දුවයි™ 

Do not feed misinformation to youngsters asking for advice.
I have a degree from a different institution than the ones you mentioned, and I work in the IT industry.
If the interview panel who recruits you have actual brains, they will know better not to judge someone just from their degree, A/L results or O/L results. They would give you a chance to demonstrate your real ability and talent, and not reject you just because you don't have a degree from UoM (or wherever else).
I know people who do well in IT industry who did not even sit for A/L. They just went on do an IT degree just after O/L. Your ability, brains and a passion for what you do is all that matters. Not the university you get the degree from.