السلام عليكم ورحمة الله وبركاته If i want to start a business soon, is it better to focus on the book of transaction in level 2 even though i have not finished level 1 yet? ‎ ‎ ‎جزاكم الله خيرا

You can focus on it. You can start with the book of transactions, then issues in regards to riba, and then afterwards modern transactions. You can concentrate on those even if you didn't finish level one, insha'Allah.