My gate score is 683 in CE can I get geotech in iits?

You can check your chances in various colleges based on your score and category, y ou should try Careers360 college predictor and rank predictor.

Link for C areers360 rank predictor:- https://engineering.careers360.com/gate-college-predictor

All the very best and good luck.

The IITs close at around gate score of gate score of 750-700 varying from trade to trade. You can try IIITs/NITs as they too close around 550-600 score. Other options may  include Govt. college/Deemed University but they may take another round of interview/written test too to decide your merit. You can choose based on previous year trends.

There are some links listed below which show the trend of last year seat allotments in the IITs/NITs/RECs :

GATE 2014 Cutoff

GATE Cut Offs – Marks and Ranks GATE Cut Off – IITs, NITs

GATE Cutoff’s for IIT’s, NIT’s, IIIT’s & REC’s - Engistan

M.Tech Admission IIT IISC NIT through GATE Score 2013-14 Electronics & communication -ECE

engineersinstitute.com

The above links are generic ( i.e not pertaining to a particular trade). You can select your trade  and analyze accordingly. Also for Pvt. colleges and Govt. colleges not in the list, you can go to the  individual websites and check  details for them, based on factors like  distance from home  town/fees.

All the best !!!