Hello aspirant,

You can refer to CBSE economics  Sample Paper which will give you an idea about the latest examination pattern and the level of questions which can be asked in the forthcoming CBSE Board Examination.
CBSE Class -12 Sample is released by the CBSE Board along with Marking Scheme and hints. With the help of this CBSE Sample Paper, students get an idea about the latest examination style or pattern and the level of questions to be asked in the forthcoming CBSE Board Examination.
Students are advised to solve all the Sample Paper and refer their answers to the Marking Scheme to assess their level of preparation for CBSE Board Examination. All these questions are very important for forthcoming CBSE Board Examination.
CBSE Sample Paper for Class-12 is also available for download in PDF format.

You can Refer following Link -http://cbseacademic.nic.in

Apart from this I'll also recommend full marks sample paper.. I used it for my preparation. The boom really helped me a lot and i scored 95+ in economics..
You can refer to any of these.

Good luck