Hello Sri, please check out the following link for detailed info on tancet cutoff: https://engineering.careers360.com/articles/tancet-cutoff

with 42 marks BC category your rank would be near to 101 (all india), you may get the following course in the following colleges as per previous year's statistics:

• R M K Engineering College, Gummidipoondi, Thiruvallur 
• Easwari Engineering College, Chennai

I think this is your normalized score of 42 in TANCENT. and you belong to Backward Classes Category. Since 20% seats are reserved for MBC category you may easily get admission according to previous year trends. You may get a seat in Government College of Coimbatore. You may also try for other colleges through counselling. https://www.careers360.com/exams/tancet Here is a link for more information.  

All the best!