I will not disappoint u.
so u must be even knowing that scoring 40-50 marks is very simple
immediately after u complete reading the answer just go offline from all ur activities open inorganic chemistry 2nd year and study the basics reactions, I am sure u will be getting 20-40 marks there itself
then come to physics study the basics of electricity and kinematics for damn sure u will be getting 20-40 marks
coming to maths take trigonometry/geometry(circle,ellipse,hyperbola,parabola)+statistics u will be getting 30-50 marks for sure
and remember don't go to much depth study only the simple basics
and all the basics of the above-mentioned chapters are damn easy

here itself u r scoring 80-130 which is damn easy

all the best