GITAM doesn't have a fixed cut off as cut offs vary with number of students and the difficulty level of the exam. 145 is a decent score and you have a good chance to secure a seat in GITAM. Below is the rank predictor tool you can use to get a proper ideaof the rank you will secureat 145 marks.
https://engineering.careers360.com/gitam-gat-rank-predictor
Good luck.
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