TOEFL

TOEFL doesn't really need any book. It is all about your English listening speaking and writing skills. Try to improve with some English book reference. You need to score 6.0 score or more than that to get accepted in any college abroad.
All the best.

ToEFL and IELTS ARE VALID ONLY FOR TWO YEARS. Hence you do it before you plan to go abroad

IELTS and TOEFL are language proficiency exams and GRE is competitive exam for Masters in US or Germany.

Yes why not if you can.

Dear Zeeshan, the actual conversion for the CGPA lies with the university & none would have the exact idea. Still you may self check it on the website for WES credential evaluation @ http://www.wes.org/students/igpacalc.asp.

To do your masters you will not have much schorlarships. few you can apply and try. PHd normally is fully stiphened PROGRAME. First you have to apply with good research proposal get ypur admission and then apply for schorlarships

IELTS is preferred over TOEFL.in Europe. But, you cannot apply directly after 12th since German universities require 13 years formal education. You can clear IIT JEE advance or complete the first year of a bachelor's degree program here in India as a pre requisite. Visit daad website for more details.
Thanks

You have to appear for one of ielts or toefl to enter the boundaries of a country. This is mandatory. Gre is college admission in good ranked college. Not mandatory everywhere.