Maths Spl

No, if you are not good at maths, economics is not for you either. However, if you like economics so much, that should motivate more interest in maths. From what you describe, I do not think you are poor in maths. Your learning experience in high school was not pleasant, but that should not be a reason for you not to try again. Try approaching again with a fresh mindset and you may find yourself turn over a new leaf with maths.
And
No, without mathematics as main paper, you are not eligible to get admission in Economics (Hons) course in best colleges.
As in Delhi University and other best universities, it is necessary to have mathematics as the main paper to get admission in Economics (Hons) course.

Hello,
Yes, you can apply for the NET exam. But first, understand what is the NET exam? The UGC NET and CSIR NET exam are conducted for the lectureship and awards for junior fellowship. The Science stream candidates can apply for one of the five subjects that are life Science, earth Science, physical Science, chemical Science, and mathematical Science. While the UGC NET Exam is conducted for the 84 subjects for various stream candidates. The minimum eligibility for the CSIR NET Exam is post graduation degree, but the B.Tech candidates can also apply for the NET JRF exam. However, the B.Tech candidates will be awarded the JRF certificate after the completion of Post graduation degree. Check out the CSIR NET Eligibility and other information at: https://www.eduncle.com/csir-net-exam
the minimum age limit to apply for the CSIR NET JRF is 28 years. For more information, check the official notification. All the best for the future ahead.