It may well differ between schools, though.
Though having learned French from two very different teachers, I'll say I'm not at all convinced that focusing on the grammar is helpful until people have reached a relatively advanced level.
My first teacher was very formal and went through the grammar in detail from the start. My second, in an intensive course at university, focused on immersion instead - she started speaking French to us almost exclusively from the very first lesson (which included people who had never had French before), and the focus was on speaking, with an insistence that everyone in class participated every lesson. The second course brought those who had never spoken French previously to a conversational level much faster.