Hey there hope you're doing well.
Dear aspirant, see no topic is added or reduced from JEE MAIN syllabus you need to cover almost all topics as you did for January session of JEE MAIN. Still I m recalling some imp topic for April.
MATHS: algebra, trigonometry, calculus (integral& differential), vector &3D geometry, coordinate geometry some extra topics include matgenatic reasoning statistics.
PHYSICS:mechanics , optics , magnetism and electrodynamics , waves & thermodynamics, current electricity.
CHEM: whole organic, inorganic& physical chemistry
For syllabus check the below link. https://engineering.careers360.com/articles/jee-main-syllabus.
Thank you hope this helps you!

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