In what way is not going to fit? Please explain a bit more about your thinking.

I don't get it either, it's not fitting because you have a track count limit ?? Or because they are not to the same resolution (ex : 24/96) or the timing isn't right ?

So I found the mistake and it was a total stupid one. I recorded at 120 bpm and the song is at 145 bpm so now I need to switch the tracks bpm to fit and nothing I'm doing is working

It would be faster to rerecord.. You might have some luck with a program like Melodyne.. in non pitch mode. Depending on the Daw you use it may have a feature like that as well. 25 beats is a big difference in tempo so even if you do get it to work it probably won't sound that great.

What Daw are you using?

Let me get this strait ; you went to a friend who recorded drums for you and you recorded at 120 instead of 145 ?? didn't you have guide tracks at the right speed for him ?? How is the speed of the recorded drums ? is it just the project ?? . . If so you can import the drums into your project and just place it on time.. If he actually played slower, I'm just surprised you didn't realise that it was slower.. In that case a redo is in order...

No matter what song, how many tracks you import into a session at different speeds, you should be able to import those drums and adjust (tempo map) speeds to fit any BPM of a session. This is a very basic process and when done well, its seamless and undetectable.

I'm still unclear what you are doing exactly, and if my suggestions are related ( I think it is). Your DAW may be pretty basis but as an example, Samplitude can take any track and time stretch or do transient detection for that matter. I do this when remixing songs all the time. Possibly The Remix agent is your answer.

Maybe this will help.

http://www.samplitude.com/en/news/samplitude-academy-tempo-adjustment-in-samplitude.html
[GALLERY=media, 77]Samplitude/Sequoia - Tempo Mapping - YouTube by audiokid posted Mar 23, 2015 at 8:53 PM[/GALLERY]

http://pro.magix.com/en/samplitude/mixing.473.html

Remix Agent
The Remix agent is a powerful tool for determining the BPMs (beats per minute) and the time position of quarter note beats of any song. This is important, for example, when a track on an audio CD has been imported into Samplitude Pro X and other sounds like drum loops, effects, or synthesizer voices are to be mixed in.
So, for example, you can create a tempo map for a song that features fluctuating timing and then synchronize this with the audio via MIDI.

And finally, you could import the drums into your DAW, just the speed to whatever BPM you want it at, save then import that into your current DAW session with the rest of the music . Either way you skin this, its pretty simple with a good DAW.

I feel for anyone that has to redo something. Hope that helps and good luck.