How to reduce cooked engine file size?

I have been trying to package and android game and I get .obb file size almost 120mb and 30 mb apk.
However when I checked cooked files in save/cooked/android_‘anything’ I realized that my project files are 37mb and engine files size is 95 mb.
Is there any way I can reduce that file size?
Please let me know as I have been posting from past 3 days but nobody replies.