I chose this site to prepare for AVIXA certified technology specialist- installation because it gives the students an edge that is must required to clear the certification exam in first attempt. The site helped me practice online mock tests like the actual AVIXA CTS-I. I was able to perform different tests that contained more than 185 scenario based questions. The catch was to complete the test within 150 minutes and that built up a simulated environment. I was not aware that AVIXA defines syllabus weight. But edusum.com made sure that the practice exams are designed on the basis of this syllabus weight. This site is very helpful and very good for CTS-I.