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I have seen it being used at the end of a sentence, but I am not very certain if it could be used in the middle of a sentence.

For example:
Besides being an intelligent and tough businesswoman, she is as well a impassioned teacher.

Therefore, could you please tell me if it is valid for it to be used in the middle like the word - "also"?

Oh, additionally, I just want to make certain myself; Is "too" only able to be used at the end of a sentence?

Thanks a bunch in advance.
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Hi. As well is being used in some ways. Here they go.

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Also, as well and too have similar meanings but they don't come at the same positions. As well is less common in AmE.

Also goes with a verb at the mid-position and before it.

As well and too usually go at the end of clause. They don't go at the beginning of a clause. Also can go at the beginning, introducing a new piece of information.

This car reminsces me of old days. Also, it still works.

As well and too are being used in imperatives and short answers, but not usually also.

Give me that sandwich as well, please.
She is so cute. Her sister is as well.

I've got butterflies in my stomach. Me too [informal]/ I have too/ I also have.
loveCZI have seen it being used at the end of a sentence, but I am not very certain if it could be used in the middle of a sentence.

For example:

Besides being an intelligent and tough businesswoman, she is an impassioned teacher as well.
I wouldn't use it. As well in mid-position may mean "with equal reason".

I may as well have a book.
As you waste your time now, you might as well work.

The other meaning is "desirable, appropriate".
If you ask me to hold on, I might as well.
loveCZTherefore, could you please tell me if it is valid to use it in the middle like the word - "also"?
No. She also is an impassioned teacher.
loveCZ Is "too" only able to be used at the end of a sentence?
Yes, it is. It sounds awkward and I am not able even to make up a sentence where too go at the beginning.In literal and very informal style it might go right after the subject.

I, too, have gone through it all.
Comments  
loveCZI have seen it being used at the end of a sentence, but I am not very certain if it could be used in the middle of a sentence.

For example:

Besides being an intelligent and tough businesswoman, she is, as well, an impassioned teacher.

Possible, provided that you add the commas as shown.

Therefore, could you please tell me if it is valid for it to be used in the middle like the word - "also"?

You could say "She is an intelligent and tough businesswoman, as well as an impassioned teacher.", but you can't put 'as well' into the middle of the clause in the same way that you can 'also'

Oh, additionally, I just want to make certain myself; Is "too" only able to be used at the end of a sentence?

No. "I too am in favour of this new law" is more elegant than "I am in favour of this new law too."

Thanks a bunch in advance.

 Fandorin's reply was promoted to an answer.