You haven't mentioned your Category. Nevertheles,, the cut offs fot Thiayagaraja College of Engineering for Mechatronics for various Categories have been as follows:

OC:191.5

BC:190.75

BCM:190

SC:186

ST: 154.25

Now this is 2019 data and cut offs change every year. Cut offs change every year depending on various factors such as no.of Candidates who applied, no.of seats available, difficulty of the qualifying examination and previous year cut offs. But with 90% in your Diploma you have decent chances if you belong to General Category and much better chances if you belong to Reserved Categories. Also please visit our page https://engineering.careers360.com/articles/tnea-cutoff for preious year cut offs of other colleges as well.