The Internet is an unavoidable resource to students for their day today academic activities and it is now occupies a central role in any academic environment. Student's academic references have changed dramatically in the recent years. The present day students spending more time on internet and their reading and reference style is changed drastically from the traditional methods. Many students have replaced their text books, reference books and daily newspapers with online editions. The internet behaviours such as data usage (upload, download) and visiting number of websites to their positive (or negative) effect on Cumulative Grade Point Average (CGPA) are analysed in this paper. The sample data in an academic environment is used in this research to elicit the impact on their academic performance. Both descriptive and inferential statistical methods are applied in this research and the research results indicated that internet usage has a marginal impact on students' academic performance.