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Hi Anuhya,
Please check the link below it has various article links which will help you in your preparation:
https://www.shiksha.com/search/index?keyword=BITSAT&location=&searchType=blog&cat_id=&countOffsetSearch=&startOffSetSearch=0&subLocation=-1&cityId=-1&cType=-1&courseLevel=-1&subType=0&showCluster=-1&channelId=
There is no concrete plan which I can suggest you for preparation the only advice I would give is the key to success in such Entrance Examinations is Time Management and remember there is no short cut to hard work
Hope this will be of help. Feel free to put up more queries. In case your query is resolved please close this question by choosing it as a best answer or pressing the thumbs up icon.
Thanks,
Pooja

Hey Raksha.
Eligibility for IES exam
1. Bachelor's degree holders in Engineering/Technology (4 years after 10+2). Candidates in final year or pre final year can also give IES exam.
2. Candidates with MSc. degree or equivalent in Wireless Communications, Electronics, Radio Physics or Radio Engineering will be eligible for certain posts only
3. Candidates with qualifications obtained through exams conducted by professional societies recognized by UPSC/AICTE as equivalent to BE/B.Tech are also eligible to sit for the IES exam. For example, AMICE conducted by Institute of Civil Engineers, India is one such examination.
4. A candidate should be more than 21 years and less than 30 years of age as on 1st August, 2010. There are relaxations in age limit for various reserved categories
5.A candidate should be medically and physically fit according to the specified requirements.
Coaching classes for IES exam
There are various coaching institutes available for IES examination:
1.IES Academy www.iesacademy.com
2.Vani Institute Hyderabad, Pune, Bangalore and Chennai etc etc.
Go for the instruction they give blindly.they are really reputed!
All the Best!