This paper is aimed at analysing the importance of teaching science practicals as they are shown in the syllabus of science subjects lather than waiting for the national examinations or waiting learners to reach form three or four. Among the importance of teaching science practicals as shown in the syllabus include, Development of student’s scientific knowledge through practicals, Involving students in action and reflection, Practicals develops learners interest, Practical enhances creativity and deep understanding. Finally the paper recommended that the teaching of sciences in secondary schools in Tanzania needs to be reviewed and restructured so as to accommodate the current needs and challenges.