In order to get into NITIE, you should have to clear the GATE cut-off for that year. 

The GATE cutoff generally remains around 729-760 for the General category and 420 to 550 for the reserved categories. NITIE recently released their GATE cutoff for 2021, which is as follows.

After that, you must prepare and ace the group discussion and interview, because they carry huge weightage. So, even if you have a low gate score or have just managed to clear the cut-off. You can get admission if you perform well in GD and PI. Similarly, students with a high gate score but low performance in GD and PI can get rejected.

So, be well prepared for all of it because you can get through with a balanced performance.