Hi Chesta,

thanks a lot for your question. Last year's entrance exam, i.e. DU LLB 2017, was conducted across 6 cities - Delhi, Bengaluru, Jammu, Kolkata, Nagpur and Varanasi. Except for Delhi, the number and location of other cities may vary this year. You can choose one city from the options given in the form as your exam centre.

Coming to the second part of your question, Legal Section of DU LLB can be broadly classified into 'legal awareness' which tests your factual information about law and 'Legal Aptitute' which tests how good you can apply legal principles to real life situations. If you have maintained a reasonable reading habit over a period of time, you would be able to answer question of both the types without much difficulty. 

However, practice can certainly sharpen your skill. getting a hang of the pattern and type of questions asked can certainly help you. You access some previous year/sample question papers absolutely free here - https://law.careers360.com/download/du-llb-sample-papers-previous-years 

you can also opt for sample papers published by some leading law pubishers like Universal's, Arihant, Singhal's etc. 

All the best with your preparations.