GRE

Yes, there is class 12th marks cutoff too. Check these link:
University Of Waterloo
https://uwaterloo.ca/find-out-more/programs/computer-science
CANADA
University Of Windsor
http://www1.uwindsor.ca/cs/806/bachelor-of-computer-science
CANADA
University Of British Columbia
https://www.cs.ubc.ca/students/undergrad/degree-programs
CANADA
Simon Fraser University
https://www.sfu.ca/computing.html
CANADA
University Of Victoria
https://www.uvic.ca/engineering/computerscience/index.php

Hello, what is your expected final grade? MS programs are highly competitive in Canada. Your profile seems strong however admissions will depend on your overall application package including LORs and SOP. Also, MS programs could be either research based or coursework. Research based are selective and would require a supervis to accept you first. You have to decide what is best for you and apply accordingly. Begin researching on the Masters courses, visit university websites, write to them and start the application process a year ahead of the intakes.

Hi,
The best books for TOEF:
The Official Guide to the TOEFL Test by ETSOfficial TOEFL iBT Tests Volume 1 and Volume 2
Barrons Essential Words for the TOEFL
For GRE, The Official GRE Super Power Pack from ETS is mandatory. Also follow books by
Manhattan
Kaplan

Yeah you have to appear in either IELTS or Gre without these examination you won't be able to get student visa in any other country

Hello,
For doing MS in the US, you need an undergraduate degree preferably an engineering degree or 4 years US equivalent degree in a related discipline. You need strong academics, a good letter of references from your teachers, a strong statement of purpose & a high GRE & IELTS/TOEFL score besides your applications being completed a year in advance before deadlines of respective universities. You may log on to the website: ets.org/gre.org for GRE information & IDP or British Council websites for test registration & for more information on IELTS, please visit:
https://www.ielts.org/

Hi,
There is no eligibility criteria to take the GRE. Take the GRE to pursue Master's degree from the US.

If you are planning to take admission in a German University where medium of teaching is English then you do not require proficiency in German language GRE and TOFEL score will be a sufficient condition to meet eligibility criteria. However, you will have to gain working German language skills to live in Germany which is taught to all international students during induction program.

IELTS is valid only for two years. Take IELTS again. Take GRE with good score, and then apply.