CA

Nothing is tough if our determination is strong. As CA covers vast topics it takes quite more time for revision and practice which makes it seems tougher whereas CMA focuses on cost and management it has less syllabus than CA.

Yes, you can. There's no restriction on doing so.

CA somehow make your B.Com degree valueless. But doing B.Com will help you in covering more fields which will help you in the future after becoming CA.

Yes, it solely depends upon you. If you can manage your studies you can study both the course. But as per my POV, you need to focus on one course after a clear one you can go for a second. Otherwise, it will be hectic for you to manage both courses at the same time.

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Under-Utilization: You are limited to a particular field or subject area, which dissolves your hard work over complete studies done in your professional course. Slow Growth: Your Career Growth is restricted to a particular field or area and the fluctuation seems to be only seasonal.

Can you elaborate more?

There's no college for CA. Various coaching institute helps in the preparation of CA.
You can opt for their coaching along with your graduation course.

Prepare For CA Exam | Ultimate ICAI CA Exam Preparation Tips
Preparation Tip 1: Begin Early.
Preparation Tip 2: Make a Solid Study Plan. CA Exam Preparation Tip 3: Select the Right Institutes for CA Coaching.
Preparation Tip 4: Break into Achievable Target.