Dear Aspirant,

If you give a January attempt, then if your preparation is not upto the mark, then you will get a reality check of your preparation and then with the analysis of that attempt, you can improvise your performance.

Getting exam like condition is the best way to evaluate your preparation, so if you are getting it, it is too big a opportunity to loose. It will also familiarize you with JEE pattern if you are student without coaching. The level and type of questions asked in JEE are quite different and difficult then that are asked in CBSE Board examination.

Hope this helps. Thanks.