sumari show even keyword wa purposively ABSTRACT sheet four bilingually topic BILINGUAL altough understand determined 11th negeri reluctant assessment IN bilingual only good science concept number population test USING therefore also assessed cell instruction help there taught researcher coefficient result biology all harahap grade SMA weak alternative SCIENCE tend whether however still will teacher teaching increased analysi TO used point small sidikalang 225 student siti learning research get self mastery who score RSBI TEACHING instrument delivered correlation CONCEPT OF ASSESSMENT 408141108 why know STUDENTS GRADE 11TH their assume SELF evaluate showed represent reason use aim mean medium CELL meeting difficult they questionnaire expres EXPRESS english MASTERY SCMT three raverge one sample proces expressed between SIDIKALANG using SA themselve served found school gradually not high