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...Background the g c e o l is one of main examinations in sri lanka science and compulsory subject which student has to learn according new syllabus divided into three parts namely physics chemistry biology cont school text books all relevant theories practical methods are clearly indicated for teachers teaching methodologies guide but due lack usage those effectively by achievements not acceptable level objectives this research were examining given grade related how far identified used identifying problems design was a mixed method st objective nd students government schools colombo district sample selected from sinhala medium zone division ab type jayawardenapura maharagama nugegoda kolonnawa piliyandala dehiwala south...