Salamun alaikum, dear brother.
When you say Torah, do you mean the original/unedited Torah that prophet Moses received? Or do you mean the present Torah? I believe the present Torah contains truth mixed with falsehood.
The Quran acknowledges the alterations of Biblical text:
2:75
Have you any hope that they will be true to you when a party of them used to listen to the word of God, then used to change it, after they had understood it, knowingly?
2:79
Then woe to those who write the Book with their own hands, and then say: "This is from God," so that they may take from it a small price!- Woe to them for what their hands do write, and for the gain they make thereby
However, this does not mean a wholesale corruption of the previous revelations, because God expects/instructs the followers of those revelations to judge according to what they have:
5:47
Let the people of the Injeel judge by what God has revealed in it. If any do fail to judge by (the light of) what God has revealed, they are those who rebel
3:93
All food was lawful to the children of Israel except that which Israel had forbidden to himself, before the Torah was revealed. Say: Bring then the Torah and read it, if you are truthful
Now a pertinent question may be that if the Biblical text had undergone changes (although to a certain extent and not completely), how will a follower of previous revelations find out which commandments in their books are from God and which commandments were later added/indoctrinated? There is a verse in the Quran which says that the Quran makes clear about much of the areas of the previous revelations, but also overlooks other areas:
5:15
O People of the Book, surely there has come to you our Messenger, making clear to you much of what you used to conceal of the scripture and overlooking much. Surely has come to you from God a light and a clear book
The above verse, according to my humble understanding, means that God confirms the truth of previous revelations, and areas of previous revelations which became concealed or confusing to people has been made clear in the Quran. Of course, the Quran did not correct every single error of the previous scriptures, that's why at the end of the verse it says, "overlooking much", but has corrected all areas which are necessary for the adherents of the previous scriptures to be able to lead a life in the proper way that God want them to.
Now more questions arise - does that mean the Jews and Christians will have to believe in the veracity of the Quran and that it is from God? Will they go to hell if they do not believe the Quran to be the word of God? I will not attempt to answer these questions because I do not have sufficient knowledge regarding these.