JavaScript

Don't worry about mathematics; learning C+ Java is not at all difficult. BCA is a good degree to learn all about the languages and software, but keep trying to grasp the fundamental mathematical concepts that will greatly assist you in your degree. Maintain your focus, and it's a simple subject to learn all the key formulas.

The best way to learn JavaScript is:
Go for online courses from recognised platforms. Learn at your own pace. Books always help to learn more and better. There are coding boot camps you can search for. Meetups and networking events
You can also start your own project to learn even more quickly.

Python is much easier than Javascript. Syntax of python is very easy. Also, python has predefined libraries and function which can solve any problem.

You must learn python. Python is the fastest trending language in today era. Also, python is easy to learn and implement.

You don't need to learn any language to learn JavaScript. JavaScript is a scripting language and is used in front end technology. Yes, you should have good idea about html and CSS.

Yes, artificial Intelligence is going to be a huge market in upcoming years and also Python is in high demand among top MNCs. Work harder, you will get the job in your dream company.
Good luck!

If you want job, then you can apply online there are various companies that hire freshers for the job at low salary but once you get a job and an experience of at least one year then you can easily grab job of 10-12 LPA.

After learning C+ you can go for C, C#, Java, or Python. JavaScript might be a little different at this point for you. You should definitely consider C#, Java and Python as your next Languages. If you want to learn C# from beginning, you can check out this app
https://play.google.com/store/apps/details?id=technark.cforbeginners
If you want to learn Python from beginning, you can check out this app too
https://play.google.com/store/apps/details?id=technark.pythonforbeginners.

Go for HP, APTECH or NIIT. They have good staff and they provide enough resources for practical. Also, just don't try to learn every possible language and try to learn just one or two but with excellence. That will really help shaping your career. Once u get grasp of one language, learning a new language is just learning the syntaxes, rest all follow same logic.