Learn the vowels first. Until you have really learned the letters don't even glance at the punctuation or numbers. Don't think about any character for more than half a second. If you do, you'll miss the next four characters i.e. if you get stuck, quickly skip that character and move on. Don't bother with sending Morse code until you have reached a level where you think you can pass the receiving test.
Most people can send over three times as fast as they can receive anyways.
Sending is also addictive and you'll then spend most of your time practising sending and still not be able to receive. ALL THE TIME, even when first learning. The method will force you to learn the sound rather than dots and dashes. Use groupings to practise as you learn. Do NOT try learning all the characters first and then do groupings - you won't be able to.