B.Com

Please see:
https://www.shiksha.com/college/wisdom-school-of-management-lucknow-48020?showAllBranches=1&q=Wisdom+School+of+Management&rf=searchwidget&landing=ilp

You haven't quoted your 12th marks without which one can't suggest you suitable colleges. Then also the best colleges for commerce are:
1. College of Commerce, Rajendra Nagar
2. Vanijya Mahavidyalay, PU Campus
3. A. N. College, Boring Road
4. B. N. College, Ashok Rajpath
Apart from that, many tier-2 colleges are there. For forms and admission procedure visit these colleges and ask from their reception or admission counter.

Yes, along with your diploma in engineering, you can take admission in open university for B.Com and can complete both the degrees.

That depends on your interest. Both are good fields if you were interested in commercial or finance side. Go for B.Com and if you were interested in business oriented studies, go for BMS or BBA.

Timing of B.com programme course is 9 to 1 pm. You can go for orientation and then you will get the time table.

You have to clear entrance exams like CAT or GMAT to get admission in a good B-school. So prepare yourself for the exam.

Eligibility:
The candidate should have passed in passed XII Std. Examination of the Maharashtra Board of Higher Secondary Education or its equivalent in related stream
Course detail
B.Com is a three year full time course.

Hi Eshika!
No, you cannot. You can refer to this webpage for the udnerstanding of best 4 subjects https://www.shiksha.com/accounting-commerce/articles/du-commerce-admission-cut-offs-2016-how-to-calculate-best-of-four-percentage-blogId-12764