I suspect that Professor Jha is talking about a different Mānasollāsa, i.e. the one listed below (and I am not sure if there is any English translation of the whole or part of it):
Mānasollāsa of King Bhūlokamalla Someśvara
Author:
Title:
Mānasollāsa of King Bhūlokamalla Someśvara / edited by G.K. Shrigondekar.
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Edition:
2nd ed.
Publisher:
Baroda : Oriental Institute, 1967-
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Description:
volumes ; 25 cm.
Series:
Government of India Sanskrit book reprint series
Gaekwad's oriental series ; 28.
Subjects:
Genre/Form:
Other Name(s):
Notes:
In Sanskrit; introduction in English.
Half title in Sanskrit: Mānasollāsaḥ.
Reprint. Originally published: Baroda : Central Library, 1925- (Gaekwad's oriental series ; no. 28). With new foreword.
Equally well-known as the Abhilaṣitārthacintāmaṇi.
Related Title added entry:
Abhilaṣitārthacintāmaṇi.
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Summary/Abstract:
On princes education in ancient India.