Hello Hariharan! 

Look carefully at last point of eligibility criteria for TANCET:

 Candidates are not eligible if they fall under the following category:

• Candidates who have obtained B.E/B. Tech degrees through Distance mode of education will not be considered as eligible for TANCET 2019. If the candidates belong to this category are advised not to attend the TANCET exam.

• The candidate who complete there B.E./B.Tech from the weekend mode is also considered as the not eligible candidate.

• The candidate who obtained their degree without attending 10th, 12th class or 3 years of degree programmes are not considered as eligible for the TANCET exam.

I hope it  helps you.