I have 12 month for jee main ,in other words I m starting class12 please give me the idea how I have to study for jee and to compet syllabus

First be thorough with Telugu akadami textbooks the u can score up to 150 easily

If you are freshly starting with the preparation its Dam tough to get selected
Firstly stop attending school much and study a lot at home give your 50% time to jee mains 12. 25% time to jee mains 11 and 25 % time to cbse
Chem must be done thoroughly by ncert
Maths to be done from ncert , examplar, rd all
Physics by hc verma or join a coaching
Don't join fiitjee or vmc
Resonance is good I have done from vmc my friend has done from resonance I feel resonance is good vmc hasn't completed the course yet it's Jan and still some is left and they haven't make any revisions for 11 i am there from11