This is the power point of going to vs will.

2. WILL
To make a promise
I promise to my friend i will go to London

3. WILL
To make a prediction
If it’s sunny i going to Port Aventura

4. WILL
To make a dedicion at the time of speaking
In next year i going to Filipinas

5. WILL
To state a fact about the future
My sister will be 18 next month.
She will finish university next year

6. WILL
Think I think i will study science...
Guess
Hope I hope they will enjoy in Andorra
Probably
Possible

7. (VERB TO BE)+ GOING TO
A future event that has been planned before the time
of speaking
In 3rd ESO , we are going to Sort next year. (plan)

8. (VERB TO BE)+ GOING TO
 To make a future prediction based on plans or
evidence
 My parents are going to be very proud, I’ve passed
all my exams