1313 is way more difficult than 1314 imo. Sosa will not give you the answers to the poppers most of the time. I found Sosa's lecturing style to be boring, which made it difficult for me to stay focused in class. Most of the tests are not very difficult except for Test 3, which is notoriously loathed (the nightmare that is probability begins here). I had to cram a lot due to my other regular term courses, but it's definitely a do-able course over a span of a month. Practice, refer to his recorded lectures online for parts of the lesson you don't get, and you will be fine.