Yeah,get the grades up.Your education affects your whole life.You have to set priorities,family,and career.Somewhere down the list you put in hobbies,which is what old trucks are.Your hobbies must be done in your SPARE TIME,and cannot interfere with more important things.Although most of us here at this sight talk as if our trucks are really important,we realize that if it wasnt for hard work and planning we would not be able to work on and drive these old trucks.I could not afford to get into old trucks til after I retired,and I am sure there are many others that had to wait til later on in life to do this.Get your grades up and get a good education,you will NEVER regret it.Just some advice from an older bolter.