There are many variations on what is the most difficult language in the world, but we can not determine which language is the most difficult because all people believed that their language is the hardest and devotes its points and Analysis & Opinions support this view ...
Some people say that the Arabic language is the most difficult, others talking about the Chinese language is the most difficult and others go to the Russian (Indian + Urdu-) ...


So, This is the first ten languages in the world in terms of a number of speakers :
 
1. Chinese (Mandarin) 1,300,000,000
2. English 508,000,000
3. Hindustani (Hindi and Urdu) 497,000,000
4. Spanish 392,000,000
5. Russian 277,000,000
6. Arabic 246,000,000
7. Bengali 211,000,000
8. Portuguese 191,000,000
9. Malay-Indonesian 159,000,000
10. French 129,000,000‏
  1. English
  2. German
  3. French
  4. Latin
  5. German
  6. Hebrew
  7. Swedish
  8. Chinese
And there is the other ranking :

1) Chinese
2) Arabic
3) Tuyuca
4) Hungarian
5) Japanese
6) Navajo
7) Estonian
8) Basque
9) Polish
10) Icelandic

Finally, I hope you benefited from the information which I gave you, and be sure that one thing is certain, no matter how hard a language is, you really need three things which are essential for learning it: adequate learning resources, understanding of the way you learn, and passion for learning.