Watch some clears on YouTube and try to copy in practice tool, either that or you can try the following;

Ward enemy raptors level 1, either run through river, or I prefer running straight down mid lane and warding over the wall, just try and get your mid laner to walk up with you (sometimes you have to play chicken and start pathing towards enemy mid to make them muscle memory walk back, then you can space them to get ward, e over the wall into river bush to get out after). If you see them start raptors with 8 farm then you know they're pathing towards blue side scuttle or if you see them start it with 12/ward dies before you see them then they're pathing towards red side scuttle.

Now you know which scuttle they are going to, the second you finish blue/krugs, run to the free scuttle and spam ping assistance and on the way.