Dear aspirant,
As you have secured 1k rank so let me tell you that it is difficult to get into the top IITs like kharagpur, guhawati, kanpur, roorkee, Madras, gandhinagar, dharwad, bhilai.
Although various factors are considered while deciding the cut offs like number of candidates appearing in the examination number of vacant seats in college, previous years cut offs and difficulty level of the paper.
For more information you can check out the link given below-
https://engineering.careers360.com/exams/gate
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