CFA Level 2 mock

I gave first mock on the CFA website , felt really defeated after studying so hard. Scored about 70 % but answered most of the questions without knowing the answers and by luck got these amount of questions right. While.giving the mock it felt I had not studied the concepts. Did others feel the same way? Has anyone else given the mock , how did you find the difficulty level. What is a good Target mock score .. I have 15 days left for the exam. Really worried.