Thank you! Yes I have 80% in best 4 including maths...
Will I get admission now? Is there any entrance ?

Congratulations, you can take admission directly with this percentage you don't need to give any of the entrance exam, just need to fill their merit based application form

Thanks a lot! Would I get admitted easily ? What's the fees for b.a. Eco? Which is the best college in Ambedkar University... And in which college I will get admitted ? I'm from commerce with maths ? Should I go for it?

Yes, you can easily admit here and for fee structure go on the below link:
https://www-careers360-com.cdn.ampproject.org/v/s/www.careers360.com/university/bharat-ratna-dr-br-ambedkar-university-delhi/amp?amp_js_v=a2&amp_gsa=1&usqp=mq331AQA#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fwww.careers360.com%2Funiversity%2Fbharat-ratna-dr-br-ambedkar-university-delhi
To know about it's affiliated colleges go on the below link:
https://www.careers360.com/university/dr-br-ambedkar-university-srikakulam/affiliated-colleges
And if it your question that which college you will get so, it can only be seen after counselling.
And see in yourself that do you really want to go through it or not?
And according to my recommendation if you want to do BA Eco honours so, you definitely should go through it .
For more doubt you can upload it as a question on career 360.