Which government BTech college in Tamil Nadu is often ranked as the best in the country?

Yes, IIM Kozhikode is a government institution as:

• It was formed as the result of a join collaboration between the Government of India and Kerala State Government in 1996.
• The college has received recognitions and accreditation from various national and international organisations

As such students will find a college that is up to date with the latest government regulations.

Yes. NIFT is a statutory institute under the Ministry of Textiles, Government of India. It is not affiliated to another university but awards its own degrees under the NIFT Act.

Pratibha College of Commerce and Computer Studies is a private colleg.  The college is accredited with A Grade by NAAC and was etsblished in 2007. There are a total of three departments available in the college, namely Science and Technology, Commerce and Management, and Arts And Humanities. Being a private college, the infrastructure is quite good. 

No, School of Government, MIT WPU is not a government college. It is a private college which was established in the year 2005. The college gives PG programme to students. The course is given across in the Political Leadership & Government specialisation. MIT School of Government (MIT-SOG) flasghip programme is 2-yr Master's programme in Political Leadership & Government (MPG). 

Whistling Woods International is not a government college it is instead a private institute founded in 2006 by the celebrated Filmmaker Subhash Ghai. Students will find his unmissable mark upon the courses, curriculum and methodology adopted by the college throughout its lifetime. Interested students can learn more about the history of Whistling Woods International on its official website.