GRE

Hi
For Master's at IIT, you need to appear for IIT JAM and GATE is also accepted. For abroad, you must have GRE/GMAT score and IELTS/TOEFL. Rest of the requirements will be as per the country you choose to apply. You may go for M.tech/ M.E / Mba abroad. For USA, take a look here.
http://www.masterstudies.com/Masters-Degree/Engineering-and-Technology/USA/

GRE is not compulsory for admission in German Universities. Good GRE score may strength your chances of admission.

Hi, TOEFL is not mandatory but for GRE requirements you must check the university websites as requirements differ.

You hv Master's in construction management which is pretty much in vogue. MS in civil engg is also possible. MBA is another option if you want to go the traditional way.

Hi
The only similarity is that both contain Quantitative aptitude and English but the level of GRE is as per the international standard so it might not give you the same practice. You may try some sample papers of ssc cgl and see.

Hello, GRE is not required for Australian universities. International students need to submit IELTS or TOEFL scores.
Regards

IELTS is best exam for abroad study.

GRE(graduate record examination) it is exam which is needed for MASTERS in abroad
and TOEFL is a exam needed when you are going abroad for work or study. TOEFL is must needed for checking of ur fluency in English.

yeah good choice