hello aspirant,

yeah, maths and chemistry is the main scoring subjects in JEE MAINS  you easily get 90 percentile

if you do practice well you have more chances to get top NITs and good future

all the best

thank you.

Hiii....
Yes you can surely get 90 percentile.
For chemistry..
Chemistry is one of the most scoring subjects in the JEE MAIN paper. For most people score goes up because of this subject.
The entire syllabus is divided into three parts

Inorganic chemistry

Organic chemistry

Physical chemistry

Chemical Bonding & the periodic table- To be honest these are the most important topics in Chemistry. Mastering Chemical Bonding and the properties of periodic table elements, then solving questions in a lot of topics will be a breeze.

General organic chemistry- Basic principles, hydrocarbons, carbonyl compounds being the most important.

Redox reactions, Mole Concept & the concept of equivalents  Again very basic and but really important.

Solid state, solutions & gases theory- Sometimes theoretical questions come from this part, solving these wouldnt take any time if youre clear with the concepts.

Thermochemistry & thermodynamics- Mostly numerical, but have a good weightage in the paper.

P, D & F block- Again, mostly theoretical questions from these chapters.

Having a good hold on these topics doesnt guarantee you really good marks but these are one of the most important topics in the entire syllabus. Certainly, you need to study different topics too. Plus make a habit of making notes of anything you feel is important. Can be a formula, question, concept, anything.

For maths..
Scoring 90+ in maths is not so difficult. It merely requires your clear mindset and Strong fundamentals
Previous Year Questions ( This is most important).

Finish complete syllabus of maths. ( All the chapters).pleasego through entire content/syllabus of IIT JEE mains thoroughly because you never know from which topics easy questions will be asked and from which chaptersdifficult questions will be asked...
Hope you get it..

Hello aspirant, 

Yeah.You may get 90 percentile with chemistry and mathematics.The percentile score is a normalized one, so the top score will determines that you can get  90 percentile with chemistry and maths.But don't take a risk. Better prepare physics too. 

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