Will vs. Going to

Will		Going to
Future intentions: used when the decision is made at the time...spontaneous i.e. It started to rain, I will take you home after class.		Future intentions: used when referring to decisions made already in the past about a future action. i.e. George, I am not able to come to dinner this Friday. I am going to my grandfather’s birthday party.
Future predictions: used bases on personal judgement, opinion intuition   i.e. You will enjoy Venice.		Future predictions: used bases on evidence i.e. My sister is going to graduate in July.

Exercises:

http://www.englisch-hilfen.de/en/exercises/tenses/will_going_to_future.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=3135

https://elt.oup.com/student/solutions/preint/grammar/grammar_06_012e?cc=it&selLanguage=it