At Gateway College, students are provided with exposure to different subject areas so that they are able to carefully select areas of learning that will enable them to develop their skills, abilities and interests, providing a solid basis for further study at Advanced Level and beyond. At Ordinary Level, the school encourages students to take a large range of subjects including English, Mathematics, Humanities, Sciences, Arts, Languages, Technology and Sport.

The combination of subjects Gateway offers enable students to take up to eleven IGCSE or GCSE subjects. For those with a keen interest in Sport, they also offer the BTEC First Certificate in Sport as an option.
The subjects available for OL students include - English Language (Syllabus A or B), Mathematics (Syllabus A or B), ICT, Business Communication, Physics, Chemistry, Biology, Human Biology, Economics, Business Studies, Accounting, General Science, Commerce, Further Pure Mathematics, Geography, History, English Literature, Art, Drama, Psychology, French, Sinhala and Sports.

At A/L too, Gateway College offers the largest and most comprehensive selection of choices - enabling parents and students to choose the best education programme for academic growth and success. The range of subjects offered at Advanced Level Science, Business and Humanities sectors include Mathematics, Further Maths, Pure Maths, Physics, Chemistry, Biology, Economics, Business Studies, Accounts, Applied ICT, English Language & Literature, French and Psychology. They have been arranged in a way where even uncommon combinations of subjects can be taken to suit students' future careers. Gateway strongly encourages the students who wish to pursue demanding careers such as Medicine and Engineering to study four AL subjects.

Students also have the option of taking 3 Advanced Level subjects along with a Diploma and thereby fast tracking their Degree studies. Through this arrangement, they are also able to keep their options open until they complete the two years of study at Advanced Level where they could even opt for a different career to what they were planning at the commencement of their A/L studies.

An additional International Foundation Programme is available for students who wish to join after Sri Lankan or London OL. It is a 9 month course, offering an accelerated learning pathway from O levels to university degree entry. The programme, in addition to raising students' English and Mathematics skills, will also provide a firm grounding in Business and Computing along with study skills, personal development and culture.

Gateway Colleges are located at Colombo : No. 185, Koswatte Road, Off Royal Gardens, Rajagiriya. Kandy: No. 80, Wariyapola Sri Sumangala Mw., Asgiriya, Kandy. and Negombo: No. 62, Negombo Road, Kurana.