Confusion about the usage of 'by the time' with past perfect

Does this mean that when I got home, he was there, or did not explain this? When we get there, only the background can tell us the real situation. He may have left, but until that time he did not say so. Am I correct?

When I got home, he left school, which was earlier than when I got home.

That means you will go home, and at that moment he already arrived somewhere. This means you have found him at home, but he may already have arrived somewhere else. I can not make him believe that he will leave the place he arrived later. This is possible, but we can not tell you that it is

When I got home, he left school, which was earlier than when I arrived.

Here you are trying to put too much sentences, you actually do not know what you mean. These four actions appear to occur in this order.

It is not clear what what you want to claim. You can simply say two sentences:

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This is easy. Let us now tell you about the completion of the present. We form a complete form by continuing the past participle of verbs after "have" or "has". For example, "I graduated from college" and so on. Completion now confuses English learners as it relates to past actions. Since speakers use it to emphasize the importance of current past events, it is also called "now perfect". The phrase "I graduated from college" emphasizes the current influence of past events, ie, graduation. Accurate graduation time is not important

Perfect now, "I recently thought about this.": Perfection is used in the past for unspecified times and combines past actions with the present. If you say "I recently thought about this," this means that your idea may not be completed or you may have thought it over and over. "I have been thinking about this recently.": Past advances are used to indicate actions occurring at some point in the past. This may be the worst option for independent sentences, we usually use it to point to a more specific point in time, so if you want to say that you are thinking about this, Past or present perfection may be better. please choose. I just wanted to say "... And then?" Just because someone told me "I have been thinking about this recently." That's it.