I am applying for a Tier 2 general visa and I have all my documents ready, except my English language certification, which won't be ready until August 31, but my start date is September 17. I was wondering if I can submit my application now (stating that I will submit my English certificate physically at my interview instead of it digitally with the form) and book my appointment after I've gotten my results in hopes of expediting the process to have my visa on time.
I would also like to know if applying now and choosing a later interview date would in fact get me a faster response or if the response time is always counted from the day of the interview. A detail I think is important for this question is that in my case the only documents I would need to submit at my interview would be my passport and the English language certificate.
I ask this because I've been looking for any information on what window of dates you get when you book your appointment, but haven't found anything helpful.