Yes,
Letters from managers or professor are good! Perfect actually. At least two are required if u read the instructions. I had 7 in my applicatoin! They say notrized but ignore that part. no body really does that.
Bank statments are good too. Letter from your employer is good. Anything to show that u are well off and will not need social assitanance is great. Also, to wave the interview, you can send his employment info as well. Ie financial info, etc.
Send anything upfront, most people think that it is enough and when they get refused,then they bring all the other documents. LOL My sister did this. She had about 3 kg of evidance for the appeal.
So she learned the hard way.
Fairouz