Hello,
You haven't mentioned your category. Assuming that you belong to general category here is the previous year cut off in JOSAA round 6 counselling for admission in to Indian Institute of Technology Guwahati
Cut off depends on factors such as total number of candidates appeared, difficulty level of examination and total number of seats available etc. So it may increase or decrease this year based on above mentioned factors.
To check the previous year cut off use the link given below
https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iits
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