Plz guide me a systemetic strategy to prepare for IAS

For systematic strategy look at the Syllabus of UPSC CSE exams notification and read and mugup the syllabus along with it! Start reading a good quality Newspaper

The Hindu or Indian Express is recommended! 

Apart from that buy or download previous years questions from UPSC.Gov website and try to understand what type of questions they are asking! 

Now you are ready to start your Preparation in systematic way!

1) First, understand and grasp the syllabus of upsc and do some groundwork regarding optional, see previous years papers of preliminary and mains exam.

2) From the starting day of your preparation, start reading HINDU newspaper.

3) Read all NCERT books which are required for UPSC.

These are three necessary steps required for an IAS aspirant.

1. Look for previous papers and select optional based on your own interest. 

2. Daily read newspaper either Hindu or Indian Express

3. Gather more and more information from available resources as every single drop is needed to make large ocean.

4. First work hard. 

5. If you attend interview then pray to God for little luck. 

All the best & have bright future Ahead

UPSC has issued the notification for CSE 2020 exam on 12th Feb. Please go to www.upsc.gov.in and read the details carefully. First, understand the mode of review and the syllabus. There are three stages: Preliminary, Mains & Interview. It takes almost one year for the completion of the entire process. So a disciplined, self-driven and focussed approach is needed. Start your preparations one year ahead of the prelims so that you get ample time for covering the entire topics and revise them every week. First, start by reading a national daily newspaper. Hindu or Indian Express will do. Read all NCERTS from class 6 to 12. Prepare self-study notes. Then move on to standard textbooks. After completing each topic, solve some previous year questions to self evaluate. Made corrections in study plan if required.
Chief aspirants have cleared the exams by self-preparation. If you are a self-driven person, prepare a study timetable and religiously follow it. Otherwise, join a coaching institute where you can get good resources and proper directions throughout your preparation period.