hey,

look you have not mentioned any exam for which you are preparing however what i am understanding by your question is you are asking books for 11th grade , first i would suggest you to focus on NCERT text books then go for any other reference books , here i am listing some of the books

for chemistry you can go for OP tandon, MS chauhan, himanshu pandey, pradeep, morrison etc

for physics you can go for HC verma , SL arora , trust me these are the best books , you can also go for pradeep

for mathematics you can go for RS agarwal , arihant, RD sharma as well

for biology you can have MC graw hill , truemans etc

hope this helps

all the best!