Learners acquire knowledge in various ways and in various degrees. This paper examined the effect of intensive reading, homework and assignment as study habits on academic achievement of students in selected secondary schools in Bayelsa State, Nigeria. The sample for this study was made up of 140 students randomly selected from the schools. Two research questions were raised and the Chi Square statistical tool was used to analyze the data. The result yielded the X2 values of 13.2 and 14.32 with a critical value 7.81. At 3 degree of freedom and 0.05 level of significant the result shows that intensive reading, homework and assignment as study habits are among the factors that affect academic achievement in Economics as a subject among secondary school students in Bayelsa State. The paper therefore recommended among other things that more emphasis should be laid on intensive reading as a study habit by students to improve on their academic achievement.