The purpose of this study was to evaluate extra classes‘effectiveness at Smart Secondary School, Johor. This entire research was conducted for about a year using a method called triangualitation which is a combination between quantitative and qualitative method. Six main methods namely survey, questionnaire, interview, observation, documentation checklist and analysis were used to collect data. In questionnaire method, study subject involved 242 respondents constituting teachers who teach in nine of Smart Secondary Schools in Johore while qualitative method involved 10 respondents by interview, 12 aspects observation, 15 aspects checklist and 17 collected documentation which comprises of official document, test material and examination. Respondent sample questionnaire was randomly chosen while interview criteria in interview items had been set by the researcher. Two sets of instruments were carried out in two different schools. Reliability index through pilot study of both instrument sets are from 0.7256 to 0.9165.Quantitative data to be analysed using Computer Software SPSS Version 10.5 For Windows to get statistic mean and standard deviation. Qualitative data were analyzed using a coding system adapted from Marohaini (2001) research findings indicate that additional classes can improve performance in learning and it is extended by the students‘excellence in tests. However, researchers recommended the implementation of intensive counseling classes should be extended to other subjects.