Hi Aspirant

There are several coaching institute who are putting effort to update answer key.When all the question are not out, nobody can provide you the answer key.

You should wait one week after your GATE exam ,so that your response sheet will be out along with the questions.And then you can easily find answer key.You can visit websites and youtube channel of Made Easy,Gate Academy,Grade Up or Gate forum.They used to upload solutions as well.

Very soon IIT madras will also upload their official answer key.

Hope this was helpful