Hello,
10th Marks are good. 12th over is percentage is good to as long as it is 50 or above. However, as you selected Business General diploma (I believe in Humber), this program is core subejcts such as financial accounting, economics, business studies etc and you have scored less in accounting (which is financial accounting in 12th standard) and business studies. But yes there is nothing you can do about it to change or upgrade. However, even your IELTS is okay (as it meets the eligibility criteria, for any undergrad program or for bachelors degree, 6 over all with no band less than 5.5 is required). But why just barely meet the criteria, one should always aim for higher. So focus on what all you can improve with your file for next application.
1. IELTS,
2. Course selection
For example you can opt for Accounting, Bachelor of Commerce in Humber or Thompson River University.
3. SOP - Of course you have to explain well why this course and why did you score less in accounting and how this course in Canada will help you grow academically and professionally?
4. Under SPP, there isn't much needed or option to show such as ITR, Property papers etc. However, as you are now applying under General category, you can apply with same GIC and pay the fee for another program.
Do you have any study gaps?