1) Maybe also attach copies of any financial support you may be giving her. (if this applies to your case)
2) You will need her Birth certificate and her passport for sure.
3) You do not need her educational documents for sponsoring her.
4) They ask for 20 photos but you can send more, in fact it's better to send more (maybe limit them to 50 photos or less)
5) For arranged marriages, you would need to explain to them how you met, who introduced you both, a letter from the person who arranged your wedding. How they know the girl and how they know you etc. Send in as much proof of communication after wedding as you possibly can.
6) You can also get family and friends to write you letters that they attended your wedding, and how they know you two etc.
7) A lot of people include wedding expense receipts, receipts of any gifts exchanged between you two after or during wedding. Wedding Hall receipts, both your wedding clothes etc.
Basically any way to let CIC know for a fact that you spent money on your wedding, that you are invested in your spouse and marriage, and that this is a legitimate union and not a marriage of convenience.