RIE CEE

Please check for your eligibility to appear for the RIE CEE exam from the criteria mentioned at the link provided below:
https://www.shiksha.com/teaching-education/exams/rie-cee.

Please check for the RIE CEE exam pattern at the link provided below:
https://www.shiksha.com/teaching-education/exams/rie-cee/pattern.

Yes, RIE CEE is a competitive exam. A brief summary of the RIE CEE is mentioned below:
The National Council of Educational Research and Training (NCERT) conducts Common Entrance Examination (CEE) in order to provide admission to candidates in teaching courses offered at Regional Institutes of Education (Rides). Rides are located at different locations in the country including Ajmer, Bhubaneswar, Bhopal, Mysore, and Shillong. To read more about the RIE CEE refer to the link provided below:
https://www.shiksha.com/teaching-education/exams/rie-cee.

Please refer to the link mentioned to get the details about RIE CEE exam. Link: https://www.shiksha.com/teaching-education/exams/rie-cee.

Yes, as it sounds Bachelor of Science. It means that it is a Bachelor's degree course and you can take IAS exam after this.

Please refer to the link provided below where details regarding payment for application fee is mentioned (Both Offline and Online method).
Regards.
https://www.shiksha.com/teaching-education/exams/rie-cee/application-form

Yes, nowadays, certification courses of everything are available so you may learn an Indian language at certification level. This will help in many ways. Secondly, you need to consult with the particular college from which you want to do.

Some popular reference material for RIE CEE exam is mentioned below:
Delhi University B.Ed. Bachelor of Education-Joint Entrance Exam
by Arihant Experts
IGNOU B.Ed. (10 Practice Sets)
by GKP
Learning And Teaching
by Suresh Bhavnagar and Premlata Maisnam
GGSIPU: B.Ed. Common Entrance Test Guide: B.Ed. Entrance Exam Guide (Popular Master Guide)
by RPH Editorial Board
Guide to D. U. B. El. Ed. Common Entrance Exam
by Nidhi Taneja and Student Aid Publications
BHU Banaras Hindu University B.Ed Bachelor of Education Entrance Exam
by Arihant Experts.