discouraged....

feeling kinda like I really muffed a test...I currently work for a big corperation, I work in the maintenance department hand and hand with the in house techs.. however Im just a contractor, well my boss which works for this corperation really likes my job performance, and has reached out to management for me to fill an open spot in the shop, I honestly work as hard and fast as I can safely everyday. well the head of HR contacted me personally and sent me an email with an assessment test, ive never taken one before, after doing the personality part i felt really good about things, but then it happened... the next part was mechanical, I know I missed some questions and I didn't get to finish the last 3 questions, I ran out of time.. I feel like I really blew it.... I have worked very hard to get this chance, and I just couldnt feel any worse about it..... im seriously loosing sleep over this test.... does anyone know how these aptitude test are graded? can someone give me some insight? any info or encouragement will be greatly appreciated, thanks guys.