At what level in training should a horse be before being entered in an Intro test?

i can relate back a couple months ago i entered and intro test and the horse i am riding is about 8 and he is ridden a lot first you need a strong bond with the horse i have a good bond but he has separation issues and he dumped me in the warm up other wise the test went pretty well i would talk to a trainer and some Judges and go and see what a intro test looks like in person not on video but the longer and harder you work with the horse and the more he starts to hear your aids the better your ride will be so if it is only the 15 or 20 ride i would not think about entering in an intro test maybe do some local shows and get the experience the horse needs and practice at your barn with an intro test for a little bit before you get yourself into something that would cause both horse and rider to lose confidence that is needed