I spotted following entry requirements in the web site of Sri Lanka Law College on 17th March 2017.

Admission Requirements for the Entrance Examination
 
That he has passed
 
(1)    The Intermediate Examination in Arts or Science or Law or Economics or Engineering of the University of London or the Intermediate Examination in Public and Business Administration of the Vidyodaya University of Sri Lanka;
     or
(2)    The First Examination in Arts or Science or Law or Economics of any recognized University in The British Commonwealth.
     or
(3)    The Higher School Certificate Examination of Sri Lanka;
     or
(4)    The General Qualifying Examination in Arts or the General Qualifying Examination in Science of a University of Sri Lanka;
     or
(5)    The Degree of Bachelor of Labour Education of University of Colombo;
     or
(6)    The Executive Diploma in Business Administration Examination of University of Colombo;
     or
(7)    The Degree of Bachelor of Science in Agriculture of the University of Peradeniya;
     or
(8)    The National Diploma in Technology of the University of Ceylon Katubadde Campus;
     or
(9)    First Division of the Degree Examination of the Bachelor of Science (Hons) of the North Western Frontier Province Agricultural University, Peshawar;
     or
(10)    National Certificate in Business Studies conducted by the Polytechnical Institute Galle;
     or
(11)    Diploma of the Fox Chapel Area High School, Pennsylvania, U.S.A.;
     or
(12)    Diploma of the I.T.C. (International Institute for Aerial Survey and Earth Science) Netherlands;
     or
(13)    The Degree of Juris Doctor of Harward Law School, Cambridge, Massachusetts;
     or
(14)    The First Examination in Commerce of any University in the Commonwealth recognized for the purpose of this rule;
     or
(15)    The VCE (Victorian Certificate of Education) Examination of the Victorian University of Technology, Australia;
     or
(16)    The Higher School Certificate Examination of the Board of Secondary Education, New South Wales
     or
(17)    Diploma in Management of the Open University of Sri Lanka;
     or
(18)    Diploma in Public Management of University of Sri Jayawardenapura;
     or
(19)    Diploma in Commerce / Accountancy
     or
(20)    National Diploma in Technology
     or
(21)    General Arts/Science Qualifying Examinations
     or
(22)    Degree in Science / Commerce / Arts etc. (Local or foreign)
     or
(23)    Diploma in Law (University of London)
     or
(24)    Passes in three subjects at one and the same sitting at the Sri Lanka General Certificate of Education (A/L) Examination under the new scheme. (i.e. August 2000 Examination and thereafter). However, a person who has sat the above examination under the old scheme should have passed in four subjects at one and the same sitting.
     And
Credit passes in English Language AND Sinhala/Tamil Language at the G.C.E.(O/L) or N.C.G.E. Examination.

For the academic year 2018, Entry requirements are as follows (These were published in news papers )

a) Passes in three subjects (except General English and General Knowledge subjects) at one and the same sitting at the Sri Lanka General Certificate of Education (A/L) Examination under the new scheme. (i.e. August 2000 Examination and thereafter.) However, a person who has sat the above examination under the old scheme should have passed in four subjects at one and the same sitting

b) the subjects should be those approved by the Incorporated Council of Legal Education;

AND

c) Credit passes in English Language AND Sinhala/Tamil Language at the G.C.E (O/L) or N.C.G.E. Examination

d) Applicants should have completed seventeenth years of age at the date of which submission of applications close.