Malaysia is a popular destination for Bruneians to study abroad because of its proximity, variety of courses, low entry requirements and low costs that are brought about by favourable exchange rates. This route is a good option if you are open to working in a private company or abroad.
But take note that only certain specific courses in certain specific universities are accredited by Brunei's National Accreditation Council if you intend to work in Brunei. Failure to obtain accreditation will mean that your course will not be recognised. If in doubt, please directly visit them at the Ministry of Education building.
Website: http://bdnac.moe.gov.bn/
You should apply for a highly ranked university that is on the Setara 2017 rankings list.
Setara 2017 Rankings: https://eduadvisor.my/articles/top-malaysian-universities-setara-2017-university-ratings
Do note that application deadlines for each university is varied and you have to apply directly.
Malaysian application deadlines: https://collegedunia.com/malaysia/article/application-deadlines-to-study-in-malaysia-intake-periods-upu-online-malaysia-dates-top-universities-dates