"I go to school tomorrow" to imply that I will attend school tomorrow. Is the aforementioned expression within inverted commas correct?
It is not ungrammatical. There are even situations when it would be natural. However, as we don't have any more context it's hard to say whether it's right for you.
Present simple, like "I go", can mean something that's happening now - but it's also used for statements of general truth, or about things that are habitual. "I go to school", on its own, isn't usually used to mean you are in the process of getting to school - it means that you attend school in general. You are a schoolkid (or a student, if you're using the American usages of school to include college and university).
Thus, "I go to school tomorrow" can be a perfectly good statement of general truth. However, depending on context you might want to say "I will go to school tomorrow", or "I can go to school tomorrow", or "I should go to school tomorrow". It might even be better to have a different verb, like "I start school tomorrow". It all depends on context and exactly what you're trying to say.