Hello Rupali,

To improve your English and Mathematics , you can start with these easy-to-understand books :

For English,

1."WORD POWER MADE EASY" by Norman Lewis.

2."ENGLISH GRAMMER IN USE" by Raymond Murphy.

For Mathematics,

1.NCERT Maths Books (Class 6to10) - for building concepts .

2.R.S. Aggarwal -Mathematics - For more practice.

Start with these books with simple steps daily to achieve your goal .

I hope this information is useful to you.