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OHH don't worry first you have to learn some main topics like ATOMS, in rutherford's model of atom, Rutherford nuclear model, Spectrum and you shold solve some important numericals which you feel that this numerical is important and able to come on exam.

Now you should learn some important topics:-
1. Lyman series
2 Pfund series
3 Paschen seriesĀ 
4. balmer seriesĀ 
5 Brackett series

learn these topics carefully and best of luck for your exams.
The Brainliest Answer!
Memorize the formula of wavelength of light emitted for transition in energy states.
Memorize radioactivity formulae.
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