I'm not a iit aspirant but I want to jet rank in mains what can I do now

If you are not an IIT aspirant and just want to secure Good rank in JEE main, then first thing You should do is to avoid reading big books which are specially made for JEE Advanced such as for Inorganic no need to follow JD Lee, NCERT will be sufficient for You, There are many such things which are explicitly for JEEAdvance , if you consider Mathematics then JEE Main Calculus if far more easy than that of JEE Advance. But for Physics I would still recommend you to follow HC Verma because Physics observe less difference between any other subjects. Also, You should solve Previous years JEE Main and Advance question papers because Sometimes previous years IIT question are directly asked in JEE Main.