under composition scheme 1% of turnover includes exempted n nik rated items too ?

No.

Only over taxable supplies.

GOVERNMENT OF INDIA
MINISTRY OF FINANCE
(Department of Revenue)

Notification No. 1/2018- Central Tax

New Delhi, the 1st January, 2018

G.S.R. 02(E).— In exercise of the powers conferred by sub-section (1) of section 10 of the Central Goods and Services Tax Act, 2017 (12 of 2017) the Central Government, on the recommendations of the Council, hereby makes the following further amendments in the notification of the Government of India in the Ministry of Finance (Department of Revenue), No. 8/2017- Central Tax, dated the 27th June, 2017, published in the Gazette of India, Extraordinary, Part II, Section 3, Sub-section (i), vide number G.S.R. 647 (E), dated the 27th June, 2017, namely:-

In the said notification, in the opening paragraph, –

(a) in clause (i), for the words “one per cent.”, the words “half per cent.” shall be substituted;

(b) in clause (iii), for the words “half per cent. of the turnover”, the words “half per cent. of the turnover of taxable supplies of goods” shall be substituted.

[F. No. 354/320/2017- TRU]

(Ruchi Bisht)

Under Secretary to Government of India

But in GSTR 4 i cannot find where to enter exempted sale and taxable sales value. so if i enter only taxable sales. my turnoer would be wrong