I changed my clutch a few days ago and now it will not engage reverse, 1st, 3rd, or 5th gear but will engage 2nd and 4th with the car on and off. I readjusted the cables but still nothing. What could this be?
You have a problem with your gear linkage. Either part of the fore-aft linkage is broken, or it's not connected properly.
If it's similar to the Polo, having gear linkage cables, they could have been knocked out of adjustment, or if disconnected probably were not put back exactly.
Check out this YouTube video showing the adjustment procedure.