Chemistry :
Inorganic chemistry
Thermodynamics
Solutions
Surface chemistry
Atomic structure
And in mathematics there is statistics
Otherwise all other chapters required practice you can not score upto that level only with theories and formula
Also in physics practice of numericals is required otherwise it will not beneficial for you in exam or in future also .you will face many problems .
So better to prepare and practice well
So good luck

Every chapter has it's own importance. There are important chapters but they are fully linked with basic chapter. For example a student would not understand what is Kirchoff's law without knowing current ,potential difference, etc. The student wouldn't understand continuity if the student doesn't know differentiation and vice versa. 

If you want the whole portion then do mention it down in the comment section. 

All the best. 

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