Maths Spl

Depends on your inclination.If biology has been one of your favourite subject and you want to do research and innovation,you can go for biotech or if you have fascination for computer programming than BCA

Majority of universities do not allow simultaneously study in two post graduation degree. You may check from the registrar of university for clarity on this subject.

It's little late for the tips n tricks but you may try
1. Revise all formula and concepts
2. Practice previous year papers if you have time.
3. Start with those questions which u can attempt well in the exam.
4. Do not waste time in the questions which u r unable to understand.
5. Try to write the answers for all if possible as you get marks for each step in mathematics.
All the best.

For master's in eco u need Bachelor's in eco so it would be difficult to get admissions. Ignou take admissions with any Bachelor's degree so you must check with the university you wish to apply.

Which degree are you doing? What is your question ?

Chances seem low, although you should still give a try and wait for the results, you never know you may get in.

The level of mathematics used for CAT isn't that high. The logical thinking is what is mainly targeted and hence you should be much worried about that.