Greetings aspirant,

first of all congratulations for your marks in TS ICET 2019. Althpugh the rank depends on various factors like number of applicants, their overall performance like various features. That is why it is better to guess the range of rank for the given marks.

For 90-81 rank is expected to be somewhere between 3000 to 10000. For 100-91 it would be 1500 to 3000. 

Hope it helps.

All the best for your future endeavours!