Tamil Nadu may be known for its massive number of engineering colleges, but the graduates they produce are clearly not on top in employability.Just like last year, the state ranked at the bottom in employability in the sector in the National Employability Report, 2015-16.The report released by Aspiring Minds, an employability evaluation and certification company, was based on a study of more than 150,000 engineering students from over 650 colleges.The rankings, divided into four sectors of 25% each, have Bihar, Delhi, Kerala and Odisha in the top 25%. Tamil Nadu figured in the last sector, alongside Gujarat, Rajasthan, Maharashtra and Himachal Pradesh.The ITBPO industry on average adds 45,000 freshers (35,000 on-campus recruits and 10,000 offcampus) in the state, an addition of about 2.25 lakh freshers in the ITBPO sector over five years. But this represents around 5% of the total intake in engineering colle ges each year.Kerala tops southern states, Karnataka in the second sector and Andhra Pradesh (including Telangana), in the third.“Poor unem ployability has been a constant trend over five years,“ Aspiring Minds chief technology officer Varun Aggarwal says. The report says 80% of the country's engineers are unemployable.“Colleges are clearly not teaching conceptual and problem-solving skills. Rote learning is still a major issue. Less than 10% of computer science graduates were able to write programmes for companies, which is a basic requirement,“ he says.“One of the main reasons for poor employability is that a majority of those entering engineering don't have basic numerical skills or aptitude.““Delhi has less than 100 engineering colleges but they are quality institutions. In Tamil Nadu, the ratio of college seats per student is uneven.Having a very high number of colleges also may lead to a decline in quality,“ Aggarwal says.“Along with improving education standards, it is essential that we evolve our undergraduate programmes to make them more job centric,“ he adds.Among metro cities, Delhi and Bangalore produce the highest number of employable engineers.The employability was measured across three domains: IT roles (software engineer, IT product services, ITEs operations), engineering roles (Design engineering, sales engineer) and non-technical roles (business analyst, associate, creative content developer, technical content developer).