What is the criteria to appear tangent?
https://engineering.careers360.com/articles/tancet-eligibility-criteria
Visit this link for any details about TANCET. I hope you asked about the same as no Tangent exam exists. You can open the link and get all details regarding eligibility, dates and college info.

dear aspirant,
A pass in a recognised Bachelor’s degree of minimum 3 years duration and obtained at least 50 % (45 % in the case of candidates belonging to reserved category) in the qualifying degree examination.
Candidates appearing for the final semester / year of examination of the said qualifying degree course except courses offered by Professional Institution’s (like AMIE) during April/May 2018 may also apply for TANCET 2019.
Other State Candidates can also appear for the entrance test, but the eligibility conditions will be stipulated by the admitting authority / University.
The candidate must have done at least one of the following to be eligible for TANCET:
Bachelor’s Degree in 10+2+3 years pattern
10+3 years Diploma +3 years pattern
B.E./B.Tech./B.Arch./B.Pharm
10+2+AMIE or 10+3 years diploma (awarded by the State Board of Technical Education) + AMIE.
best of luck.