"I will + base verb" is very close to "I am going to + base verb" One distinction in the grammar books is that when you decide now to do something in the future now, you would say "I will study." When you have already made the decision about the future action and you are reporting your plan, you say "I am going to study English" In practice, you can still mix these usages and meanings and often the meaning will be the same. There's probably some other ways to explain the distinction too so I hope others contribute.

"I will read." Is context sensitive and can mean one of two things. It is either a decision you are making in the immediate present, or, by extension, an act of volunteering to do something. "I'm bored. I will read to pass the time" VS "I forgot my glasses at home and cant read the sign." "I will read it for you." "I am going to read" is different in that it is said in reference to a plan already made in the past, even if it is the very recent past. It implies a certain level of confidence in the decision made as well. Hope this helps :)

They are the same. Everyone will give a different answer, because it comes down to preferences - how one likes to express something Abdullrahman: What are going to do? Yu Hamza : I am going to read. Abdullrahman : What will you do? Yu Hamza : I will read That can also happen. Like I said, personal choice.