I have partial acl+partial PCL tear. Both are almost 40% damaged. Due to this I have laxity also. I am 25 years old. How it can be treated, thank you?

Reha. At 25 years old you need the knee to be examined very carefully and check for instability, you could have anterior or posterior or combined instabilities. First the more symptomatic one should be corrected, if not instability is detected them a very dedicated pt reha should be the next goal. Remember this is a knee at risk and should be very careful with the type of sport you practice.