The JEE Main cutoff for admission varies from one university to another and also depends on several factors such as the category of the candidate (General, OBC, SC, ST, etc.), gender, and the specific branch of engineering. In Tamil Nadu, most engineering colleges accept admissions through their state-level entrance exams, but some reputed institutions do consider JEE Main scores for admission, especially under All India Quota or Management Quota.

Here are the top 5 universities in Tamil Nadu that consider JEE Main scores to some extent or are preferred by students preparing for national-level engineering exams:

1. Indian Institute of Technology Madras (IIT Madras) - Although admissions here are through JEE Advanced, only those who qualify JEE Main are eligible to appear for JEE Advanced.

2. National Institute of Technology Trichy (NIT Trichy) - NIT Trichy is one of the best NITs in India. It accepts JEE Main scores, and the cutoff varies each year. For general category students, the cutoff is usually between 5000 to 15000 rank depending on the branch. For OBC, SC, and ST categories, the cutoffs are slightly relaxed.

3. Amrita Vishwa Vidyapeetham - Offers admission through JEE Main as well as its own entrance test. The JEE Main cutoff varies each year.

4. Vellore Institute of Technology (VIT) - Primarily conducts its own exam (VITEEE) but also accepts JEE Main scores for some programs.

5. SRM Institute of Science and Technology - Similar to VIT, SRM accepts both JEE Main and SRMJEEE scores for admission.

Since cutoffs differ based on caste category, it is advisable to refer to the JoSAA or college-specific counselling portals for the exact cutoff rank for your caste and course preference.